Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W2165134129', 'doi': 'https://doi.org/10.1093/gerona/glr172', 'title': 'Reliability and Validity of the Pittsburgh Sleep Quality Index and the Epworth Sleepiness Scale in Older Men', 'display_name': 'Reliability and Validity of the Pittsburgh Sleep Quality Index and the Epworth Sleepiness Scale in Older Men', 'publication_year': 2011, 'publication_date': '2011-09-20', 'ids': {'openalex': 'https://openalex.org/W2165134129', 'doi': 'https://doi.org/10.1093/gerona/glr172', 'mag': '2165134129', 'pmid': 'https://pubmed.ncbi.nlm.nih.gov/21934125', 'pmcid': 'https://www.ncbi.nlm.nih.gov/pmc/articles/3309871'}, 'language': 'en', 'primary_location': {'is_oa': True, 'landing_page_url': 'https://doi.org/10.1093/gerona/glr172', 'pdf_url': 'https://academic.oup.com/biomedgerontology/article-pdf/67A/4/433/1722734/glr172.pdf', 'source': {'id': 'https://openalex.org/S969433497', 'display_name': 'The Journals of Gerontology Series A', 'issn_l': '1079-5006', 'issn': ['1079-5006', '1758-535X'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310311648', 'host_organization_name': 'Oxford University Press', 'host_organization_lineage': ['https://openalex.org/P4310311647', 'https://openalex.org/P4310311648'], 'host_organization_lineage_names': ['University of Oxford', 'Oxford University Press'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['crossref', 'pubmed'], 'open_access': {'is_oa': True, 'oa_status': 'bronze', 'oa_url': 'https://academic.oup.com/biomedgerontology/article-pdf/67A/4/433/1722734/glr172.pdf', 'any_repository_has_fulltext': True}, 'authorships': [{'author_position': 'first', 'author': {'id': 'https://openalex.org/A5077221648', 'display_name': 'Adam P. Spira', 'orcid': 'https://orcid.org/0000-0003-1507-0995'}, 'institutions': [{'id': 'https://openalex.org/I145311948', 'display_name': 'Johns Hopkins University', 'ror': 'https://ror.org/00za53h95', 'country_code': 'US', 'type': 'education', 'lineage': ['https://openalex.org/I145311948']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'A. P. Spira', 'raw_affiliation_strings': ['Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland'], 'affiliations': [{'raw_affiliation_string': 'Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland', 'institution_ids': ['https://openalex.org/I145311948']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5011367705', 'display_name': 'Sherry A. Beaudreau', 'orcid': 'https://orcid.org/0000-0002-9853-9332'}, 'institutions': [{'id': 'https://openalex.org/I4210119030', 'display_name': 'Mental Illness Research, Education and Clinical Centers', 'ror': 'https://ror.org/02hd1sz82', 'country_code': 'US', 'type': 'healthcare', 'lineage': ['https://openalex.org/I1322918889', 'https://openalex.org/I2799886695', 'https://openalex.org/I4210119030']}, {'id': 'https://openalex.org/I97018004', 'display_name': 'Stanford University', 'ror': 'https://ror.org/00f54p054', 'country_code': 'US', 'type': 'education', 'lineage': ['https://openalex.org/I97018004']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'S. A. Beaudreau', 'raw_affiliation_strings': ['Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, California', 'Sierra Pacific Mental Illness Research Education and Clinical Centers, Palo Alto VA Health Care System, California'], 'affiliations': [{'raw_affiliation_string': 'Sierra Pacific Mental Illness Research Education and Clinical Centers, Palo Alto VA Health Care System, California', 'institution_ids': ['https://openalex.org/I4210119030']}, {'raw_affiliation_string': 'Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, California', 'institution_ids': ['https://openalex.org/I97018004']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5027259461', 'display_name': 'Katie L. Stone', 'orcid': 'https://orcid.org/0000-0003-2797-3171'}, 'institutions': [{'id': 'https://openalex.org/I2801780550', 'display_name': 'California Pacific Medical Center', 'ror': 'https://ror.org/02bjh0167', 'country_code': 'US', 'type': 'healthcare', 'lineage': ['https://openalex.org/I114073160', 'https://openalex.org/I2801780550']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'K. L. Stone', 'raw_affiliation_strings': ['California Pacific Medical Center Research Institute San Francisco'], 'affiliations': [{'raw_affiliation_string': 'California Pacific Medical Center Research Institute San Francisco', 'institution_ids': ['https://openalex.org/I2801780550']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5016094198', 'display_name': 'Eric J. Kezirian', 'orcid': 'https://orcid.org/0000-0003-3808-4521'}, 'institutions': [{'id': 'https://openalex.org/I180670191', 'display_name': 'University of California, San Francisco', 'ror': 'https://ror.org/043mz5j54', 'country_code': 'US', 'type': 'education', 'lineage': ['https://openalex.org/I180670191']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'E. J. Kezirian', 'raw_affiliation_strings': ['Department of Otolaryngology—Head and Neck Surgery, University of California, San Francisco'], 'affiliations': [{'raw_affiliation_string': 'Department of Otolaryngology—Head and Neck Surgery, University of California, San Francisco', 'institution_ids': ['https://openalex.org/I180670191']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5066319123', 'display_name': 'Li‐Yung Lui', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I2801780550', 'display_name': 'California Pacific Medical Center', 'ror': 'https://ror.org/02bjh0167', 'country_code': 'US', 'type': 'healthcare', 'lineage': ['https://openalex.org/I114073160', 'https://openalex.org/I2801780550']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'L.-Y. Lui', 'raw_affiliation_strings': ['California Pacific Medical Center Research Institute San Francisco'], 'affiliations': [{'raw_affiliation_string': 'California Pacific Medical Center Research Institute San Francisco', 'institution_ids': ['https://openalex.org/I2801780550']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5050330450', 'display_name': 'Susan Redline', 'orcid': 'https://orcid.org/0000-0002-6585-1610'}, 'institutions': [], 'countries': ['IL'], 'is_corresponding': False, 'raw_author_name': 'S. Redline', 'raw_affiliation_strings': ['Department of Medicine, Division of Sleep Medicine, Brigham and Women’s Hospital and Beth Israel Deaconess Medical Center, Harvard Medical School'], 'affiliations': [{'raw_affiliation_string': 'Department of Medicine, Division of Sleep Medicine, Brigham and Women’s Hospital and Beth Israel Deaconess Medical Center, Harvard Medical School', 'institution_ids': []}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5052217756', 'display_name': 'Sonia Ancoli‐Israel', 'orcid': 'https://orcid.org/0000-0002-0662-8865'}, 'institutions': [{'id': 'https://openalex.org/I36258959', 'display_name': 'University of California, San Diego', 'ror': 'https://ror.org/0168r3w48', 'country_code': 'US', 'type': 'education', 'lineage': ['https://openalex.org/I36258959']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'S. Ancoli-Israel', 'raw_affiliation_strings': ['Department of Psychiatry, University of California, San Diego'], 'affiliations': [{'raw_affiliation_string': 'Department of Psychiatry, University of California, San Diego', 'institution_ids': ['https://openalex.org/I36258959']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5041374470', 'display_name': 'Kristine E. Ensrud', 'orcid': 'https://orcid.org/0000-0002-9069-3036'}, 'institutions': [{'id': 'https://openalex.org/I4210140408', 'display_name': 'Minneapolis VA Medical Center', 'ror': 'https://ror.org/032b8d361', 'country_code': 'US', 'type': 'healthcare', 'lineage': ['https://openalex.org/I1322918889', 'https://openalex.org/I2799886695', 'https://openalex.org/I4210117246', 'https://openalex.org/I4210117924', 'https://openalex.org/I4210140408']}, {'id': 'https://openalex.org/I130238516', 'display_name': 'University of Minnesota', 'ror': 'https://ror.org/017zqws13', 'country_code': 'US', 'type': 'education', 'lineage': ['https://openalex.org/I130238516']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'K. Ensrud', 'raw_affiliation_strings': ['Departments of Medicine and Epidemiology, University of Minnesota, Minneapolis & Department of Medicine, Minneapolis VA Medical Center'], 'affiliations': [{'raw_affiliation_string': 'Departments of Medicine and Epidemiology, University of Minnesota, Minneapolis & Department of Medicine, Minneapolis VA Medical Center', 'institution_ids': ['https://openalex.org/I4210140408', 'https://openalex.org/I130238516']}]}, {'author_position': 'last', 'author': {'id': 'https://openalex.org/A5014577024', 'display_name': 'Anita L. Stewart', 'orcid': 'https://orcid.org/0000-0002-4967-9013'}, 'institutions': [{'id': 'https://openalex.org/I4210136305', 'display_name': 'Institute on Aging', 'ror': 'https://ror.org/0390vdb22', 'country_code': 'US', 'type': 'nonprofit', 'lineage': ['https://openalex.org/I4210136305']}, {'id': 'https://openalex.org/I180670191', 'display_name': 'University of California, San Francisco', 'ror': 'https://ror.org/043mz5j54', 'country_code': 'US', 'type': 'education', 'lineage': ['https://openalex.org/I180670191']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'A. Stewart', 'raw_affiliation_strings': ['Institute for Health & Aging, Department of Social and Behavioral Sciences, University of California, San Francisco'], 'affiliations': [{'raw_affiliation_string': 'Institute for Health & Aging, Department of Social and Behavioral Sciences, University of California, San Francisco', 'institution_ids': ['https://openalex.org/I4210136305', 'https://openalex.org/I180670191']}]}], 'countries_distinct_count': 2, 'institutions_distinct_count': 9, 'corresponding_author_ids': [], 'corresponding_institution_ids': [], 'apc_list': None, 'apc_paid': None, 'fwci': 11.293, 'has_fulltext': True, 'fulltext_origin': 'pdf', 'cited_by_count': 283, 'citation_normalized_percentile': {'value': 0.939646, 'is_in_top_1_percent': False, 'is_in_top_10_percent': True}, 'cited_by_percentile_year': {'min': 99, 'max': 100}, 'biblio': {'volume': '67A', 'issue': '4', 'first_page': '433', 'last_page': '439'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T10316', 'display_name': 'Sleep and Insomnia', 'score': 0.9999, 'subfield': {'id': 'https://openalex.org/subfields/3205', 'display_name': 'Experimental and Cognitive Psychology'}, 'field': {'id': 'https://openalex.org/fields/32', 'display_name': 'Psychology'}, 'domain': {'id': 'https://openalex.org/domains/2', 'display_name': 'Social Sciences'}}, 'topics': [{'id': 'https://openalex.org/T10316', 'display_name': 'Sleep and Insomnia', 'score': 0.9999, 'subfield': {'id': 'https://openalex.org/subfields/3205', 'display_name': 'Experimental and Cognitive Psychology'}, 'field': {'id': 'https://openalex.org/fields/32', 'display_name': 'Psychology'}, 'domain': {'id': 'https://openalex.org/domains/2', 'display_name': 'Social Sciences'}}, {'id': 'https://openalex.org/T11373', 'display_name': 'Effects of Sleep Deprivation and Fatigue on Performance', 'score': 0.9987, 'subfield': {'id': 'https://openalex.org/subfields/3205', 'display_name': 'Experimental and Cognitive Psychology'}, 'field': {'id': 'https://openalex.org/fields/32', 'display_name': 'Psychology'}, 'domain': {'id': 'https://openalex.org/domains/2', 'display_name': 'Social Sciences'}}, {'id': 'https://openalex.org/T10985', 'display_name': "Sleep's Role in Memory Consolidation and Regulation", 'score': 0.9933, 'subfield': {'id': 'https://openalex.org/subfields/2805', 'display_name': 'Cognitive Neuroscience'}, 'field': {'id': 'https://openalex.org/fields/28', 'display_name': 'Neuroscience'}, 'domain': {'id': 'https://openalex.org/domains/1', 'display_name': 'Life Sciences'}}], 'keywords': [{'id': 'https://openalex.org/keywords/epworth-sleepiness-scale', 'display_name': 'Epworth Sleepiness Scale', 'score': 0.7925867}, {'id': 'https://openalex.org/keywords/sleep-quality', 'display_name': 'Sleep Quality', 'score': 0.601654}, {'id': 'https://openalex.org/keywords/sleep-duration', 'display_name': 'Sleep Duration', 'score': 0.535829}, {'id': 'https://openalex.org/keywords/psychometric-evaluation', 'display_name': 'Psychometric Evaluation', 'score': 0.512889}, {'id': 'https://openalex.org/keywords/sleep', 'display_name': 'Sleep', 'score': 0.502327}], 'concepts': [{'id': 'https://openalex.org/C2776245837', 'wikidata': 'https://www.wikidata.org/wiki/Q25053505', 'display_name': 'Pittsburgh Sleep Quality Index', 'level': 4, 'score': 0.90529686}, {'id': 'https://openalex.org/C2778664715', 'wikidata': 'https://www.wikidata.org/wiki/Q1347756', 'display_name': 'Epworth Sleepiness Scale', 'level': 4, 'score': 0.7925867}, {'id': 'https://openalex.org/C2778996325', 'wikidata': 'https://www.wikidata.org/wiki/Q422201', 'display_name': 'Actigraphy', 'level': 3, 'score': 0.6635978}, {'id': 'https://openalex.org/C49453240', 'wikidata': 'https://www.wikidata.org/wiki/Q1592163', 'display_name': 'Construct validity', 'level': 3, 'score': 0.59691215}, {'id': 'https://openalex.org/C106906290', 'wikidata': 'https://www.wikidata.org/wiki/Q1140909', 'display_name': "Cronbach's alpha", 'level': 3, 'score': 0.57288986}, {'id': 'https://openalex.org/C15744967', 'wikidata': 'https://www.wikidata.org/wiki/Q9418', 'display_name': 'Psychology', 'level': 0, 'score': 0.5247776}, {'id': 'https://openalex.org/C2781433485', 'wikidata': 'https://www.wikidata.org/wiki/Q3144201', 'display_name': 'Excessive daytime sleepiness', 'level': 4, 'score': 0.5238005}, {'id': 'https://openalex.org/C150966472', 'wikidata': 'https://www.wikidata.org/wiki/Q3410145', 'display_name': 'Psychosocial', 'level': 2, 'score': 0.523157}, {'id': 'https://openalex.org/C2779951463', 'wikidata': 'https://www.wikidata.org/wiki/Q7268788', 'display_name': 'Quality of life (healthcare)', 'level': 2, 'score': 0.47818854}, {'id': 'https://openalex.org/C1862650', 'wikidata': 'https://www.wikidata.org/wiki/Q186005', 'display_name': 'Physical therapy', 'level': 1, 'score': 0.45706075}, {'id': 'https://openalex.org/C74909509', 'wikidata': 'https://www.wikidata.org/wiki/Q10387', 'display_name': 'Gerontology', 'level': 1, 'score': 0.45600852}, {'id': 'https://openalex.org/C43214815', 'wikidata': 'https://www.wikidata.org/wiki/Q7310987', 'display_name': 'Reliability (semiconductor)', 'level': 3, 'score': 0.45586184}, {'id': 'https://openalex.org/C70410870', 'wikidata': 'https://www.wikidata.org/wiki/Q199906', 'display_name': 'Clinical psychology', 'level': 1, 'score': 0.39834931}, {'id': 'https://openalex.org/C171606756', 'wikidata': 'https://www.wikidata.org/wiki/Q506132', 'display_name': 'Psychometrics', 'level': 2, 'score': 0.35511944}, {'id': 'https://openalex.org/C71924100', 'wikidata': 'https://www.wikidata.org/wiki/Q11190', 'display_name': 'Medicine', 'level': 0, 'score': 0.31007075}, {'id': 'https://openalex.org/C1513209611', 'wikidata': 'https://www.wikidata.org/wiki/Q177190', 'display_name': 'Sleep disorder', 'level': 3, 'score': 0.26991662}, {'id': 'https://openalex.org/C2781210498', 'wikidata': 'https://www.wikidata.org/wiki/Q1869874', 'display_name': 'Insomnia', 'level': 2, 'score': 0.2425561}, {'id': 'https://openalex.org/C118552586', 'wikidata': 'https://www.wikidata.org/wiki/Q7867', 'display_name': 'Psychiatry', 'level': 1, 'score': 0.23277733}, {'id': 'https://openalex.org/C2983189541', 'wikidata': 'https://www.wikidata.org/wiki/Q35831', 'display_name': 'Sleep quality', 'level': 3, 'score': 0.16675144}, {'id': 'https://openalex.org/C2778205975', 'wikidata': 'https://www.wikidata.org/wiki/Q1754874', 'display_name': 'Polysomnography', 'level': 3, 'score': 0.081077754}, {'id': 'https://openalex.org/C163258240', 'wikidata': 'https://www.wikidata.org/wiki/Q25342', 'display_name': 'Power (physics)', 'level': 2, 'score': 0.0}, {'id': 'https://openalex.org/C121332964', 'wikidata': 'https://www.wikidata.org/wiki/Q413', 'display_name': 'Physics', 'level': 0, 'score': 0.0}, {'id': 'https://openalex.org/C2781326671', 'wikidata': 'https://www.wikidata.org/wiki/Q754424', 'display_name': 'Apnea', 'level': 2, 'score': 0.0}, {'id': 'https://openalex.org/C62520636', 'wikidata': 'https://www.wikidata.org/wiki/Q944', 'display_name': 'Quantum mechanics', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C542102704', 'wikidata': 'https://www.wikidata.org/wiki/Q183257', 'display_name': 'Psychotherapist', 'level': 1, 'score': 0.0}], 'mesh': [{'descriptor_ui': 'D007319', 'descriptor_name': 'Sleep Initiation and Maintenance Disorders', 'qualifier_ui': 'Q000453', 'qualifier_name': 'epidemiology', 'is_major_topic': True}, {'descriptor_ui': 'D011795', 'descriptor_name': 'Surveys and Questionnaires', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': True}, {'descriptor_ui': 'D000203', 'descriptor_name': 'Activities of Daily Living', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D000368', 'descriptor_name': 'Aged', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D000369', 'descriptor_name': 'Aged, 80 and over', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D015331', 'descriptor_name': 'Cohort Studies', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D003863', 'descriptor_name': 'Depression', 'qualifier_ui': 'Q000453', 'qualifier_name': 'epidemiology', 'is_major_topic': False}, {'descriptor_ui': 'D003863', 'descriptor_name': 'Depression', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D006801', 'descriptor_name': 'Humans', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D006993', 'descriptor_name': 'Hypnotics and Sedatives', 'qualifier_ui': 'Q000627', 'qualifier_name': 'therapeutic use', 'is_major_topic': False}, {'descriptor_ui': 'D006993', 'descriptor_name': 'Hypnotics and Sedatives', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D008297', 'descriptor_name': 'Male', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D015995', 'descriptor_name': 'Prevalence', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D011788', 'descriptor_name': 'Quality of Life', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D015203', 'descriptor_name': 'Reproducibility of Results', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D012720', 'descriptor_name': 'Severity of Illness Index', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D007319', 'descriptor_name': 'Sleep Initiation and Maintenance Disorders', 'qualifier_ui': 'Q000188', 'qualifier_name': 'drug therapy', 'is_major_topic': False}, {'descriptor_ui': 'D007319', 'descriptor_name': 'Sleep Initiation and Maintenance Disorders', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}], 'locations_count': 4, 'locations': [{'is_oa': True, 'landing_page_url': 'https://doi.org/10.1093/gerona/glr172', 'pdf_url': 'https://academic.oup.com/biomedgerontology/article-pdf/67A/4/433/1722734/glr172.pdf', 'source': {'id': 'https://openalex.org/S969433497', 'display_name': 'The Journals of Gerontology Series A', 'issn_l': '1079-5006', 'issn': ['1079-5006', '1758-535X'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310311648', 'host_organization_name': 'Oxford University Press', 'host_organization_lineage': ['https://openalex.org/P4310311647', 'https://openalex.org/P4310311648'], 'host_organization_lineage_names': ['University of Oxford', 'Oxford University Press'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': True, 'landing_page_url': 'https://europepmc.org/articles/pmc3309871', 'pdf_url': 'https://europepmc.org/articles/pmc3309871?pdf=render', 'source': {'id': 'https://openalex.org/S4306400806', 'display_name': 'Europe PMC (PubMed Central)', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I1303153112', 'host_organization_name': 'European Bioinformatics Institute', 'host_organization_lineage': ['https://openalex.org/I1303153112'], 'host_organization_lineage_names': ['European Bioinformatics Institute'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': True, 'landing_page_url': 'https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3309871', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S2764455111', 'display_name': 'PubMed Central', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I1299303238', 'host_organization_name': 'National Institutes of Health', 'host_organization_lineage': ['https://openalex.org/I1299303238'], 'host_organization_lineage_names': ['National Institutes of Health'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': False, 'landing_page_url': 'https://pubmed.ncbi.nlm.nih.gov/21934125', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S4306525036', 'display_name': 'PubMed', 'issn_l': None, 'issn': None, 'is_oa': False, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I1299303238', 'host_organization_name': 'National Institutes of Health', 'host_organization_lineage': ['https://openalex.org/I1299303238'], 'host_organization_lineage_names': ['National Institutes of Health'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}], 'best_oa_location': {'is_oa': True, 'landing_page_url': 'https://doi.org/10.1093/gerona/glr172', 'pdf_url': 'https://academic.oup.com/biomedgerontology/article-pdf/67A/4/433/1722734/glr172.pdf', 'source': {'id': 'https://openalex.org/S969433497', 'display_name': 'The Journals of Gerontology Series A', 'issn_l': '1079-5006', 'issn': ['1079-5006', '1758-535X'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310311648', 'host_organization_name': 'Oxford University Press', 'host_organization_lineage': ['https://openalex.org/P4310311647', 'https://openalex.org/P4310311648'], 'host_organization_lineage_names': ['University of Oxford', 'Oxford University Press'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, 'sustainable_development_goals': [], 'grants': [], 'datasets': [], 'versions': [], 'referenced_works_count': 22, 'referenced_works': ['https://openalex.org/W1277966809', 'https://openalex.org/W130795321', 'https://openalex.org/W1492662589', 'https://openalex.org/W1544359545', 'https://openalex.org/W1715752662', 'https://openalex.org/W1966507238', 'https://openalex.org/W197066864', 'https://openalex.org/W1982176411', 'https://openalex.org/W2022203362', 'https://openalex.org/W2027928724', 'https://openalex.org/W2050951274', 'https://openalex.org/W2051428761', 'https://openalex.org/W2054796954', 'https://openalex.org/W2061672958', 'https://openalex.org/W2100582107', 'https://openalex.org/W2126665658', 'https://openalex.org/W2151487996', 'https://openalex.org/W2164658166', 'https://openalex.org/W2172151487', 'https://openalex.org/W2303635956', 'https://openalex.org/W2416509488', 'https://openalex.org/W4251621674'], 'related_works': ['https://openalex.org/W3157745540', 'https://openalex.org/W3138204810', 'https://openalex.org/W3112245407', 'https://openalex.org/W3092833369', 'https://openalex.org/W3034103728', 'https://openalex.org/W2269515279', 'https://openalex.org/W2188684141', 'https://openalex.org/W2184438230', 'https://openalex.org/W2007759652', 'https://openalex.org/W2004773852'], 'abstract_inverted_index': {'The': [0, 162], 'Pittsburgh': [1], 'Sleep': [2], 'Quality': [3], 'Index': [4], '(PSQI)': [5], 'and': [6, 18, 45, 51, 82, 88, 100, 111, 132, 140, 189, 195, 212], 'the': [7, 41, 49, 68, 77, 95, 101, 119, 178, 185, 193, 204, 208, 220], 'Epworth': [8], 'Sleepiness': [9], 'Scale': [10], '(ESS)': [11], 'are': [12], 'commonly': [13], 'used': [14], 'to': [15], 'quantify': [16], 'sleep': [17, 112, 168, 213], 'excessive': [19], 'daytime': [20, 109, 210], 'sleepiness': [21], 'in': [22, 36, 53, 67, 71, 159, 197, 227], 'older': [23, 37, 57, 198, 228], 'adults.': [24], 'These': [25], 'measures,': [26], 'however,': [27], 'have': [28], 'not': [29, 126, 217], 'been': [30], 'comprehensively': [31], 'evaluated': [32], 'for': [33, 94], 'their': [34, 123], 'psychometrics': [35], 'men.': [38, 199, 229], 'We': [39], 'determined': [40], 'internal': [42, 129, 186], 'consistency': [43, 91, 187], 'reliability': [44, 188, 224], 'construct': [46, 190], 'validity': [47, 191, 226], 'of': [48, 56, 85, 152, 157, 184, 192], 'PSQI': [50, 96, 108, 131, 163, 194, 205, 209, 221], 'ESS': [52, 102, 133, 196], 'a': [54, 83], 'sample': [55], 'men.Participants': [58], 'were': [59, 115, 135], '3,059': [60], 'men': [61], '(mean': [62], 'age': [63], '=': [64, 104], '76.4': [65], 'years)': [66], 'Osteoporotic': [69], 'Fractures': [70], 'Men': [72], 'Study': [73], '(MrOS)': [74], 'who': [75], 'completed': [76], 'two': [78], 'questionnaires,': [79], 'wrist': [80], 'actigraphy,': [81], 'range': [84], 'additional': [86], 'psychosocial': [87], 'health': [89], 'measures.Internal': [90], 'was': [92], 'adequate': [93], "(Cronbach's": [97], 'α': [98], '=.69)': [99], '(α': [103], '.70)': [105], 'total': [106, 120, 222], 'scores.': [107], 'dysfunction': [110, 211], 'medications': [113, 214], 'components': [114, 215], 'weakly': [116], 'associated': [117, 136], 'with': [118, 137, 141, 203], 'score,': [121, 207], 'but': [122], 'removal': [124], 'did': [125], 'notably': [127], 'improve': [128], 'consistency.': [130], 'totals': [134], 'each': [138], 'other': [139], 'theoretically': [142], 'related': [143], 'variables': [144], '(ie,': [145], 'actigraphic': [146], 'variables,': [147], 'depressive': [148], 'symptoms,': [149], 'mobility/instrumental': [150], 'activities': [151], 'daily': [153], 'living,': [154], 'health-related': [155], 'quality': [156], 'life)': [158], 'expected': [160], 'directions.': [161], 'differentiated': [164], 'participants': [165], 'reporting': [166, 172], 'no': [167], 'disorder': [169], 'from': [170], 'those': [171], 'particular': [173], 'disorders': [174], 'more': [175], 'reliably': [176], 'than': [177], 'ESS.In': [179], 'general,': [180], 'we': [181], 'found': [182], 'evidence': [183], 'Despite': [200], 'low': [201], 'correlation': [202], 'global': [206], 'do': [216], 'appreciably': [218], 'reduce': [219], "score's": [223], 'or': [225]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2165134129', 'counts_by_year': [{'year': 2024, 'cited_by_count': 17}, {'year': 2023, 'cited_by_count': 25}, {'year': 2022, 'cited_by_count': 23}, {'year': 2021, 'cited_by_count': 40}, {'year': 2020, 'cited_by_count': 26}, {'year': 2019, 'cited_by_count': 27}, {'year': 2018, 'cited_by_count': 24}, {'year': 2017, 'cited_by_count': 22}, {'year': 2016, 'cited_by_count': 21}, {'year': 2015, 'cited_by_count': 13}, {'year': 2014, 'cited_by_count': 19}, {'year': 2013, 'cited_by_count': 16}, {'year': 2012, 'cited_by_count': 6}], 'updated_date': '2024-09-13T11:20:31.225032', 'created_date': '2016-06-24'}