Consequences of the timing of menarche on female adolescent sleep phase preference
Open accessAbstract
Most parents experience their children's puberty as a dramatic change in family life. This is not surprising considering the dynamics of physical and psychosocial maturation which occur during adolescence. A reasonable question, particularly from the parents' perspective, is: when does this vibrant episode end and adulthood finally start? The aim of the present study was to assess the relationship between puberty and the changes in sleep phase preferences during female maturation and adulthood by a cross-sectional survey. The results from 1'187 females aged 5 to 51 years based on self-report measures of sleep preferences on weekdays and on free days as well as the occurrence of menarche, show that in contrast to prepubertal children, adolescent females exhibit a striking progression in delaying their sleep phase preference until 5 years after menarche. Thereafter, the sleep phase preference switches to advancing. The current study provides evidence that a clear shift in sleep-wake cycles temporally linked to menarche heralds the beginning of "adult-like" sleep-wake behaviour in women and can be used as a (chrono)biological marker for the onset of adulthood.
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
The increase in eveningness continues until approximately age 18-20, when sleep preference undergoes a long slow shift toward earlier sleep times (morningness).
“The increase in eveningness continues until approximately age 18–20, when sleep preference undergoes a long slow shift toward earlier sleep times, a.k.a. morningness (Frey, Balu, Greusing, Rothen, & Cajochen, 2009; Roenneberg et al., 2004).”
From Sleep and circadian contributions to adolescent alcohol use disorder (2015) · cites this paper as Frey et al., 2009
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Cites
Impact of sleep debt on metabolic and endocrine function
Spiegel, K., Leproult, R., & Van Cauter, E. (1999) · The Lancet · doi:10.1016/s0140-6736(99)01376-8 · Cited by 3,668 · see citing works
Life between Clocks: Daily Temporal Patterns of Human Chronotypes
Roenneberg, T., Wirz-Justice, A., & Merrow, M. (2003) · Journal of Biological Rhythms · doi:10.1177/0748730402239679 · Cited by 2,662 · see citing works
Social Jetlag: Misalignment of Biological and Social Time
Wittmann, M., Dinich, J., Merrow, M., & Roenneberg, T. (2006) · Chronobiology International · doi:10.1080/07420520500545979 · Cited by 2,625 · see citing works
Sleep Schedules and Daytime Functioning in Adolescents
Wolfson, A. R., & Carskadon, M. A. (1998) · Child Development · doi:10.1111/j.1467-8624.1998.tb06149.x · Cited by 1,676 · see citing works
A marker for the end of adolescence
Roenneberg, T., Kuehnle, T., Pramstaller, P. P., Ricken, J., Havel, M., Guth, A., & Merrow, M. (2004) · Current Biology · doi:10.1016/j.cub.2004.11.039 · Cited by 1,585 · see citing works
Association between Puberty and Delayed Phase Preference
Carskadon, M. A., Vieira, C., & Acebo, C. (1993) · Sleep · doi:10.1093/sleep/16.3.258 · Cited by 1,167 · see citing works
Regulation of adolescent sleep: Implications for behavior
CARSKADON, M. A., ACEBO, C., & JENNI, O. G. (2004) · Annals of the New York Academy of Sciences · doi:10.1196/annals.1308.032 · Cited by 792 · see citing works
Circadian preference, sleep and daytime behaviour in adolescence
Giannotti, F., Cortesi, F., Sebastiani, T., & Ottaviano, S. (2002) · Journal of Sleep Research · doi:10.1046/j.1365-2869.2002.00302.x · Cited by 703 · see citing works
Patterns of sleep and sleepiness in adolescents.
Carskadon, M. A. (1990) · PubMed · Cited by 553 · see citing works
Pubertal Changes in Daytime Sleepiness
Mary, A. C., Harvey, K., Duke, P., Thomas, F. A., Iris, F. L., & William, C. D. (1980) · Sleep · doi:10.1093/sleep/2.4.453 · Cited by 545 · see citing works
Is obesity associated with poor sleep quality in adolescents?
Gupta, N. K., Mueller, W. H., Chan, W., & Meininger, J. C. (2002) · American Journal of Human Biology · doi:10.1002/ajhb.10093 · Cited by 438 · see citing works
Duffy, J. F., Dijk, D., Hall, E. F., & Czeisler, C. A. (1999) · Journal of Investigative Medicine · doi:10.1177/108155899904700310 · Cited by 431 · see citing works
Development of sleep patterns in early adolescence
Laberge, L., Petit, D., Simard, C., Vitaro, F., Tremblay, R. E., & Montplaisir, J. Y. (2001) · Journal of Sleep Research · doi:10.1046/j.1365-2869.2001.00242.x · Cited by 362 · see citing works
KERKHOF, G. A., & Dongen, H. P. A. V. (1996) · Neuroscience Letters · doi:10.1016/s0304-3940(96)13140-2 · Cited by 344 · see citing works
Sleep and morningness‐eveningness in the ‘middle’ years of life (20–59y)
CARRIER, J., MONK, T. H., BUYSSE, D. J., & KUPFER, D. J. (1997) · Journal of Sleep Research · doi:10.1111/j.1365-2869.1997.00230.x · Cited by 303 · see citing works
The impact of school daily schedule on adolescent sleep
Hansen, M., Janssen, I., Schiff, A., Zee, P. C., & Dubocovich, M. L. (2005) · PEDIATRICS · doi:10.1542/peds.2004-1649 · Cited by 289 · see citing works
Mongrain, V., Lavoie, S., Selmaoui, B., Paquet, J., & Dumont, M. (2004) · Journal of Biological Rhythms · doi:10.1177/0748730404264365 · Cited by 252 · see citing works
Duffy, J. F., & Czeisler, C. A. (2002) · Neuroscience Letters · doi:10.1016/s0304-3940(01)02427-2 · Cited by 241 · see citing works
Pubertal correlates in black and white girls
Biro, F. M., Huang, B., Crawford, P. B., Lucky, A. W., Striegel-Moore, R., Barton, B. A., & Daniels, S. (2006) · The Journal of Pediatrics · doi:10.1016/j.jpeds.2005.10.020 · Cited by 210 · see citing works
Pubertal development in Swiss girls.
Largo, R. H., & Prader, A. (1983) · PubMed · Cited by 194 · see citing works
The Human Circadian Timing System and Sleep–Wake Regulation
Czeisler, C. A., & Buxton, O. M. (2011) · Elsevier eBooks · doi:10.1016/b978-1-4160-6645-3.00035-9 · Cited by 183 · see citing works
Knutson, K. L. (2005) · American Journal of Human Biology · doi:10.1002/ajhb.20405 · Cited by 176 · see citing works
Age at menarche of mothers and daughters, with a note on accuracy of recall.
Damon, A., Damon, S. T., Reed, R. B., & Valadian, I. (1969) · PubMed · Cited by 164 · see citing works
Accuracy of short-term recall of age at menarche
Koo, M. M., & Rohan, T. E. (1997) · Annals of Human Biology · doi:10.1080/03014469700004782 · Cited by 146 · see citing works
Age at menarche: Accuracy of recall after thirty-nine years.
Damon, A., & Bajema, C. J. (1974) · PubMed · Cited by 144 · see citing works
The accuracy of recalled age of menarche.
Livson, N. H., & McNeill, D. B. (1962) · PubMed · Cited by 134 · see citing works
A note on the accuracy of recalled age at menarche
Bergsten-Brucefors, A. (1976) · Annals of Human Biology · doi:10.1080/03014467600001151 · Cited by 126 · see citing works
Age-related changes in melatonin levels in humans and its potential consequences for sleep disorders
Waldhauser, F., Ková>cs, J., & Reiter, E. (1998) · Experimental Gerontology · doi:10.1016/s0531-5565(98)00054-0 · Cited by 119 · see citing works
Age at puberty and father absence in a national probability sample
Bogaert, A. F. (2005) · Journal of Adolescence · doi:10.1016/j.adolescence.2004.10.008 · Cited by 118 · see citing works
Menarche and voice change as indicators of the pubertal growth spurt
Hägg, U., & TARANGER, J. (1980) · Acta Odontologica Scandinavica · doi:10.3109/00016358009004718 · Cited by 112 · see citing works
Åkerstedt, T. (1976) · Biological Psychology · doi:10.1016/0301-0511(76)90019-3 · Cited by 77 · see citing works
Plasma Melatonin Rhythm in Normal Puberty: Interactions of Age and Pubertal Stages
Cavallo, A. (2008) · Neuroendocrinology · doi:10.1159/000126147 · Cited by 68 · see citing works
Griefahn, B., Bröde, P., Blaszkewicz, M., & Remer, T. (2002) · Journal of Pineal Research · doi:10.1034/j.1600-079x.2003.02931.x · Cited by 61 · see citing works
von Schantz, M., & Archer, S. N. (2003) · Journal of the Royal Society of Medicine · doi:10.1258/jrsm.96.10.486 · Cited by 25 · see citing works
Kolata, G. B. (1984) · Science · doi:10.1126/science.6701512 · Cited by 12 · see citing works
Flagged first, then by citations
Cited by
Sorted by citations
School Start Times for Adolescents
ADOLESCENT SLEEP WORKING GROUP, COMMITTEE ON ADOLESCENCE, COUNCIL ON SCHOOL HEALTH, Au, R., Carskadon, M., Millman, R., Wolfson, A., Braverman, P. K., Adelman, W. P., Breuner, C. C., et al. (2014) · Pediatrics · doi:10.1542/peds.2014-1697 · Cited by 468 · see citing works
Crowley, S. J., Van Reen, E., LeBourgeois, M. K., Acebo, C., Tarokh, L., Seifer, R., Barker, D. H., & Carskadon, M. A. (2014) · PLoS ONE · doi:10.1371/journal.pone.0112199 · Cited by 273 · see citing works
Increased Sensitivity of the Circadian System to Light in Early/Mid-Puberty
Crowley, S. J., Cain, S. W., Burns, A. C., Acebo, C., & Carskadon, M. A. (2015) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jc.2015-2775 · Cited by 248 · see citing works
From Lark to Owl: developmental changes in morningness-eveningness from new-borns to early adulthood
Randler, C., Faßl, C., & Kalb, N. (2017) · Scientific Reports · doi:10.1038/srep45874 · Cited by 238 · see citing works
Watson, N. F., Martin, J. L., Wise, M. S., Carden, K. A., Kirsch, D. B., Kristo, D. A., Malhotra, R. K., Olson, E. J., Ramar, K., Rosen, I. M., et al. (2017) · Journal of Clinical Sleep Medicine · doi:10.5664/jcsm.6558 · Cited by 128 · see citing works
Sleep and circadian contributions to adolescent alcohol use disorder
Hasler, B. P., Soehner, A. M., & Clark, D. B. (2015) · Alcohol · doi:10.1016/j.alcohol.2014.06.010 · Cited by 123 · see citing works
Borisenkov, M. F., Perminova, E. V., & Kosova, A. L. (2010) · Chronobiology International · doi:10.3109/07420528.2010.487624 · Cited by 116 · see citing works
Canelón, S. P., & Boland, M. R. (2020) · International Journal of Environmental Research and Public Health · doi:10.3390/ijerph17051703 · Cited by 106 · see citing works
Chronotype ontogeny related to gender
Duarte, L. L., Menna-Barreto, L., Miguel, M. A. L., Louzada, F., Araújo, J., Alam, M., Areas, R., & Pedrazzoli, M. (2014) · Brazilian Journal of Medical and Biological Research · doi:10.1590/1414-431x20143001 · Cited by 104 · see citing works
Association of Delaying School Start Time With Sleep Duration, Timing, and Quality Among Adolescents
Widome, R., Berger, A. T., Iber, C., Wahlstrom, K. L., Laska, M. N., Kilian, G., Redline, S. S., & Erickson, D. J. (2020) · Archives of Pediatrics and Adolescent Medicine · doi:10.1001/jamapediatrics.2020.0344 · Cited by 99 · see citing works
Human Adolescent Phase Response Curves to Bright White Light
Crowley, S. J., & Eastman, C. I. (2017) · Journal of Biological Rhythms · doi:10.1177/0748730417713423 · Cited by 69 · see citing works
Morningness-eveningness in a large sample of German adolescents and adults
Randler, C., Freyth-Weber, K., Rahafar, A., Jurado, A. F., & Kriegs, J. O. (2016) · Heliyon · doi:10.1016/j.heliyon.2016.e00200 · Cited by 65 · see citing works
Eckerberg, B., Löwden, A., Nagai, R., & Åkerstedt, T. (2012) · Chronobiology International · doi:10.3109/07420528.2012.719962 · Cited by 63 · see citing works
Circadian rhythms and risk for substance use disorders in adolescence
Hasler, B. P., Soehner, A. M., & Clark, D. B. (2014) · Current Opinion in Psychiatry · doi:10.1097/yco.0000000000000107 · Cited by 56 · see citing works
Relationships between sleep duration and adolescent depression: a conceptual replication
Berger, A. T., Wahlstrom, K. L., & Widome, R. (2019) · Sleep Health · doi:10.1016/j.sleh.2018.12.003 · Cited by 55 · see citing works
Carvalho-Mendes, R. P., Dunster, G. P., de la Iglesia, H. O., & Menna-Barreto, L. S. (2020) · Journal of Biological Rhythms · doi:10.1177/0748730420927603 · Cited by 50 · see citing works
Vollmer, C., & Randler, C. (2012) · Personality and Individual Differences · doi:10.1016/j.paid.2012.01.001 · Cited by 49 · see citing works
Karipidis, I., Vienneau, D., Habermacher, M., Köpfli, M., Brink, M., Probst-Hensch, N. M., Röösli, M., & Wunderli, J. M. (2014) · Noise Mapping · doi:10.2478/noise-2014-0002 · Cited by 48 · see citing works
Sleep-related and diurnal effects on brain diffusivity and cerebrospinal fluid flow
Tuura, R., Volk, C., Callaghan, F. M., Jaramillo, V., & Huber, R. (2021) · NeuroImage · doi:10.1016/j.neuroimage.2021.118420 · Cited by 44 · see citing works
Kolomeichuk, S. N., Randler, C., Shabalina, I., Fradkova, L., & Borisenkov, M. F. (2016) · Biological Rhythm Research · doi:10.1080/09291016.2016.1207352 · Cited by 44 · see citing works
Pediatric Postural Orthostatic Tachycardia Syndrome: Where We Stand
Boris, J. R., & Moak, J. P. (2022) · PEDIATRICS · doi:10.1542/peds.2021-054945 · Cited by 42 · see citing works
Predictors of post-traumatic pituitary failure during long-term follow-up
Nemes, O., Kovacs, N., Czeiter, E., Kenyeres, P., Tarjanyi, Z., Bajnok, L., Buki, A., Doczi, T., & Mezosi, E. (2015) · Hormones · doi:10.14310/horm.2002.1564 · Cited by 39 · see citing works
Eveningness is related to men’s mating success
Randler, C., Ebenhöh, N., Fischer, A., Höchel, S., Schroff, C., Stoll, J. C., Vollmer, C., & Piffer, D. (2012) · Personality and Individual Differences · doi:10.1016/j.paid.2012.03.025 · Cited by 34 · see citing works
Elite Sport is Not an Additional Source of Distress for Adolescents with High Stress Levels
Gerber, M., Holsboer‐Trachsler, E., Pühse, U., & Brand, S. (2011) · Perceptual and Motor Skills · doi:10.2466/02.05.10.pms.112.2.581-599 · Cited by 35 · see citing works
Onaolapo, O. J., & Onaolapo, A. Y. (2017) · Birth Defects Research · doi:10.1002/bdr2.1171 · Cited by 31 · see citing works
Insomnias of Childhood and Adolescence
Reid, G. J., Huntley, E. D., & Lewin, D. S. (2009) · Child and Adolescent Psychiatric Clinics of North America · doi:10.1016/j.chc.2009.06.002 · Cited by 27 · see citing works
Age and gender differences in morningness–eveningness in Turkish adolescents and young adults
Randler, C., Vollmer, C., Beşoluk, Ş., Önder, İ., & Horzum, M. B. (2013) · Biological Rhythm Research · doi:10.1080/09291016.2013.805915 · Cited by 23 · see citing works
Berry, K. M., Berger, A. T., Laska, M. N., Erickson, D. J., Lenk, K. M., Iber, C., Full, K. M., Wahlstrom, K. L., Redline, S. S., & Widome, R. (2021) · Sleep Health · doi:10.1016/j.sleh.2021.07.008 · Cited by 21 · see citing works
田村, 典., & Okamura, K. (2023) · Journal of Sleep Research · doi:10.1111/jsr.14042 · Cited by 23 · see citing works
Tinguely, G., Landolt, H., & Cajochen, C. (2014) · Therapeutische Umschau · doi:10.1024/0040-5930/a000604 · Cited by 16 · see citing works
Self-citationThe effects of sleep and light at night on melatonin in adolescents
Hersh, C., Sisti, J., Richiutti, V., & Schernhammer, E. (2015) · Hormones · doi:10.14310/horm.2002.1573 · Cited by 13 · see citing works
Yadav, A., & Singh, S. (2014) · PubMed · Cited by 12 · see citing works
Lustig, K. A., Côté, K. A., & Willoughby, T. (2021) · SLEEP Advances · doi:10.1093/sleepadvances/zpab003 · Cited by 11 · see citing works
Morningness–Eveningness and Physical Activity in Adolescent Girls: Menarche as a Transition Point
Beal, S. J., Grimm, K. J., Dorn, L. D., & Susman, E. J. (2016) · Child Development · doi:10.1111/cdev.12539 · Cited by 11 · see citing works
Association of Delaying School Start Time With Sleep–Wake Behaviors Among Adolescents
Berry, K. M., Erickson, D. J., Berger, A. T., Wahlstrom, K. L., Iber, C., Full, K. M., Redline, S. S., & Widome, R. (2021) · Journal of Adolescent Health · doi:10.1016/j.jadohealth.2021.04.030 · Cited by 12 · see citing works
Characteristic Sleep Patterns and Associated Obesity in Adolescents
Kwon, A., Choi, Y., Kim, S., Song, K., Suh, J., Chae, H. W., & Kim, H.-S. (2022) · Life · doi:10.3390/life12091316 · Cited by 7 · see citing works
Beşoluk, Ş. (2018) · Biological Rhythm Research · doi:10.1080/09291016.2018.1427601 · Cited by 7 · see citing works
Magnúsdóttir, I., Magnúsdóttir, S., Gunnlaugsdóttir, A. K., Hilmisson, H., Hrólfsdóttir, L., & Eiriksdóttir, A. E. (2025) · Sleep And Breathing · doi:10.1007/s11325-024-03238-3 · Cited by 7 · see citing works
The Relationship Between School Start Times and Educational Outcomes
Fuller, S. C., & Bastian, K. C. (2020) · Current Sleep Medicine Reports · doi:10.1007/s40675-020-00198-4 · Cited by 5 · see citing works
Fuller, S. C., & Bastian, K. C. (2022) · Urban Education · doi:10.1177/00420859211073889 · Cited by 5 · see citing works
Désordre circadien du sommeil de l’adolescent: rôle du multimédia
Schroder, C. M. (2015) · Bulletin de l Académie Nationale de Médecine · doi:10.1016/s0001-4079(19)30853-2 · Cited by 5 · see citing works
Lecarie, E. K., Doane, L. D., Clifford, S., & Lemery‐Chalfant, K. (2022) · Sleep Health · doi:10.1016/j.sleh.2021.12.006 · Cited by 4 · see citing works
Delayed school start times and adolescent health
Berger, A. T., Widome, R., & Troxel, W. M. (2019) · Sleep and Health · doi:10.1016/b978-0-12-815373-4.00033-2 · Cited by 3 · see citing works
Yamamoto, R. (2016) · Sleep and Biological Rhythms · doi:10.1007/s41105-016-0051-0 · Cited by 2 · see citing works
Disorders of Sleep in Women: Insomnia
Khan, S. S., & Khawaja, I. S. (2019) · Psychiatric Annals · doi:10.3928/00485713-20191106-04 · Cited by 2 · see citing works
Johnson, K. T., Widome, R., Larson, N., & Neumark‐Sztainer, D. (2025) · Sleep Health · doi:10.1016/j.sleh.2025.10.011 · Cited by 1 · see citing works
Hypersomnolence in Children and Adolescents: Causes, Assessment, and Management
Gandhi, K. D., Mansukhani, M. P., & Kolla, B. P. (2019) · Psychiatric Annals · doi:10.3928/00485713-20191105-01 · Cited by 1 · see citing works
Avaliação do sono e do sobrepeso em adolescentes após mudança do turno escolar
Rossi, M. B. (2010) · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)
Baylor, A. (2016) · VCU Scholars Compass (Virginia Commonwealth University) · doi:10.25772/reww-fd46
PubertyThis chapter is based in part on the chapter by Susman and Dorn .
Susman, E. J., & Dorn, L. D. (2012) · Wiley eBooks · doi:10.1002/9781118133880.hop206012
Hoff, B. F. (2018) · Illinois Digital Environment for Access to Learning and Scholarship (University of Illinois at Urbana-Champaign)
Tonetti, L. (2021) · Springer eBooks · doi:10.1007/978-3-030-65574-7_9
Vidal, H., & Shochat, T. (2021) · Elsevier eBooks · doi:10.1016/b978-0-12-822963-7.00207-3
Jetpuri, Z., Araji, F., Naqvi, K. S., & Khan, S. S. (2023) · Springer eBooks · doi:10.1007/978-3-031-24200-7_1
Delayed school start times and adolescent health
Berger, A. T., Widome, R., & Troxel, W. (2025) · Elsevier eBooks · doi:10.1016/b978-0-443-13954-3.00025-5
Johnson, K. T., Billmyer, E., Kaja, S. M., & Widome, R. (2025) · Journal of Physical Activity and Health · doi:10.1123/jpah.2025-0247
Nutrition: women’s health and ageing
Mohapatra, L., Singh, A., Mishra, D., Tripathi, A., Parida, S. K., Pingale, P. L., & Nandave, M. (2026) · Elsevier eBooks · doi:10.1016/b978-0-443-34003-1.00015-8
- Authors
- Frey, S., Balu, S., Greusing, S., Rothen, N., & Cajochen, C.
- Affiliations
- University of Basel (CH)
- University of Bern (CH)
- Corresponding author
- Frey, Sylvia
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2009-04-22
- Volume
- 4
- Issue
- 4
- Pages
- e5217
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC2668189
- OpenAlex
- W2172052550
- Cited by
- 58
- References
- 35
- Citations by year
- 2026: 1 · 2025: 4 · 2023: 2 · 2022: 4 · 2021: 6 · 2020: 4 · 2019: 5 · 2018: 2 · 2017: 4 · 2016: 5 · 2015: 3 · 2014: 9 · 2013: 1 · 2012: 4
- FWCI
- 1.20
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Bern Open Repository and Information System (University of Bern) (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Figshare (submittedVersion, cc-by)
- Open Access CRIS of the University of Bern
- Funders
- National Science Foundation
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (320000, 108108)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
- Keywords
- menarche, circadian rhythm, puberty, female adolescence, sleep-wake cycle, sex differences in sleep
- MeSH terms
- Adolescent, Adult, Child, Cross-Sectional Studies, Female, Humans, Menarche, Middle Aged, Sleep
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review