Cited by 294Autism Spectrum Disorder ResearchMaternal Mental Health During Pregnancy and PostpartumFamily and Disability Support Research

Pre‐, peri‐ and neonatal risk factors for autism

Open access
GUINCHAT, VINCENT, THORSEN, POUL, LAURENT, CLAUDINE, CANS, CHRISTINE, BODEAU, NICOLAS, COHEN, DAVID·2012·Acta Obstetricia et Gynecologica Scandinavica

Abstract

Objective. To identify pre‐, peri‐ and neonatal risk factors for pervasive developmental disorders (PDD). Methods. We searched the Medline database through March 2011 for relevant case–control and population‐based studies on pre‐, peri‐ and neonatal hazards related to PDD, including autism. We identified 85 studies for this review. Data were extracted systematically and organized according to risk factors related to family history, pregnancy, gestational age, delivery, birth milestones and the neonate's condition at birth. Results. During the prenatal period, risk factors for PDD were advanced maternal or paternal ages, being firstborn vs. third or later, maternal prenatal medication use and mother's status as foreign born. During the perinatal and neonatal periods, the risk factors for PDD were preterm birth, breech presentation, planned cesarean section, low Apgar scores, hyperbilirubinemia, birth defect and a birthweight small for gestational age. The influence of maternal pre‐eclampsia, diabetes, vomiting, infections and stress during pregnancy requires further study in order to determine risk for PDD. Discussion. Despite evidence for the association of some pre‐, peri‐ and neonatal risk factors associated with PDD, it remains unclear whether these risks are causal or play a secondary role in shaping clinical expression in individuals with genetic vulnerability. A plausible hypothsesis is that improvements in obstetric and neonatal management have led to an increased rate of survivors with pre‐existing brain damage. Given the variety of risk factors, we propose that future studies should investigate combinations of multiple factors, rather than focusing on a single factor.

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.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1111/j.1600-0412.2011.01325.x

Cites

12 of 12 references verified0 citation errors · 0 not checkable

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.

A few free checks a day · papers already verified open instantly · results are public

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?

  • Guinchat et al. pointed to three factors associated positively with the development of AD: prematurity (the risk for autism increased with the severity of preterm birth), abnormal presentation in general and breech presentation in particular, and planned cesarean section.

    “During the perinatal period, Guinchat et al. (75) pointed to three factors associated positively with the development of AD: prematurity (the risk for autism increased with the severity of preterm birth), abnormal presentation in general and breech presentation in particular, and planned cesarean section.”

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

Flagged first, then by citations

Research works printed but not linked: 86

  1. Bryson (1988; 26), Cryan (1996; 13), Croen (2005; 52, 2007; 64, 2008; 73), Gillberg (1983; 12), Glasson (2004; 48), Links (1980; 25), Torrey (1975; 20), Lobasher (1970; 18), Lord (1991; 32), Sugie (2005; 56) 5/17 Small for gestational age Buchmayer (2009; 83), Eaton (2001; 41), Hultman (2002; 44), Hultman (2010; 93), Larsson (2005; 50)
  2. Autism and Developmental Disabilities Monitoring Network Surveillance Year 2006 Principal Investigators; Centers for Disease Control and Prevention (CDC). Prevalence of autism spectrum disorders -Autism and Developmental Disabilities Monitoring Network, United States, 2006. MMWR Surveill Summ. 2009;58: 1-20.
  3. Pasamanick B, Rogers ME, Lilienfeld AM. Pregnancy experience and the development of behavior disorders in children. Am J Psychiatry. 1956;112:613-18.
  4. Bailey A, Le Couteur A, Gottesman I, Bolton P, Simonoff E, Yuzda E, et al. Autism as a strongly genetic disorder: evidence from a British twin study. Psychol Med. 1995;25:63-77.
  5. Barbaresi WJ, Katusic SK, Colligan RC, Weaver AL, Jacobsen SJ. The incidence of autism in Olmsted County, Minnesota, 1976-1997: results from a population-based study. Arch Pediatr Adolesc Med. 2005;159:37-44.
  6. Parner ET, Schendel DE, Thorsen P. Autism prevalence trends over time in Denmark: changes in prevalence and age at diagnosis. Arch Pediatr Adolesc Med. 2008;162:1150-6.
  7. Minshew NJ, Williams DL. The new neurobiology of autism: cortex, connectivity, and neuronal organization. Arch Neurol. 2007;64:945-50.
  8. Pardo CA, Eberhart CG. The neurobiology of autism. Brain Pathol. 2007;17:434-47.
  9. Guilmatre A, Dubourg C, Mosca AL, Legallic S, Goldenberg A, Drouin-Garraud V, et al. Recurrent rearrangements in synaptic and neurodevelopmental genes and shared biologic pathways in schizophrenia, autism, and mental retardation. Arch Gen Psychiatry. 2009;66:947-56.
  10. Brasic JR, Holland JA. A qualitative and quantitative review of obstetric complications and autistic disorder. J Dev Phys Disabil. 2007;19:337-64.
  11. Gillberg C, Gillberg IC. Infantile autism: a total population study of reduced optimality in the pre-, peri-, and neonatal period. J Autism Dev Disord. 1983;13:153-66.
  12. Cryan E, Byrne M, O'Donovan A, O'Callaghan E. A case-control study of obstetric complications and later autistic disorder. J Autism Dev Disord. 1996;26: 453-60.
  13. Kolevzon A, Gross R, Reichenberg A. Prenatal and perinatal risk factors for autism: a review and integration of findings. Arch Pediatr Adolesc Med. 2007;161:326-33.
  14. Gardener H, Spiegelman D, Buka SL. Prenatal risk factors for autism: comprehensive meta-analysis. Br J Psychiatry. 2009;195:7-14.
  15. Lobascher ME, Kingerlee PE, Gubbay SS. Childhood autism: an investigation of aetiological factors in twenty-five cases. Br J Psychiatry. 1970;117:525-9.
  16. Knobloch H, Pasamanick B. Some etiologic and prognostic factors in early infantile autism and psychosis. Pediatrics. 1975;55:182-91.
  17. Torrey EF, Hersh SP, McCabe KD. Early childhood psychosis and bleeding during pregnancy. A prospective study of gravid women and their offspring. J Autism Child Schizophr. 1975;5:287-97.
  18. Finegan JA, Quarrington B. Pre-, peri-, and neonatal factors and infantile autism. J Child Psychol Psychiatry. 1979;20:119-28.
  19. Deykin EY, MacMahon B. Pregnancy, delivery, and neonatal complications among autistic children. Am J Dis Child. 1980;134:860-4.
  20. Gillberg C. Maternal age and infantile autism. J Autism Dev Disord. 1980;10:293-7.
  21. Links PS, Stockwell M, Abichandani F, Simeon J. Minor physical anomalies in childhood autism. Part I. Their relationship to pre-and perinatal complications. J Autism Dev Disord. 1980;10:273-85.
  22. Tsai LY, Stewart MA. Etiological implication of maternal age and birth order in infantile autism. J Autism Dev Disord. 1983;13:57-65.
  23. Bryson SE, Smith IM, Eastwood D. Obstetrical suboptimality in autistic children. J Am Acad Child Adolesc Psychiatry. 1988;27:418-22.
  24. Laxer G, Rey M, Ritvo ER. A comparison of potentially pathologic factors in European children with autism, Down's syndrome, and multiple physical handicaps. J Autism Dev Disord. 1988;18:309-13.
  25. Levy S, Zoltak B, Saelens T. A comparison of obstetrical records of autistic and nonautistic referrals for psychoeducational evaluations. J Autism Dev Disord. 1988;18:573-81.
  26. Mason-Brothers A, Ritvo ER, Pingree C, Petersen PB, Jenson WR, McMahon WM, et al. The UCLA-University of Utah epidemiologic survey of autism: prenatal, perinatal, and postnatal factors. Pediatrics. 1990;86:514-19.
  27. Ward AJ. A comparison and analysis of the presence of family problems during pregnancy of mothers of "autistic" children and mothers of normal children. Child Psychiatry Hum Dev. 1990;20:279-88.
  28. Lord C, Mulloy C, Wendelboe M, Schopler E. Pre-and perinatal factors in high-functioning females and males with autism. J Autism Dev Disord. 1991;21:197-209.
  29. Mouridsen SE, Rich B, Isager T. Brief report: parental age in infantile autism, autistic-like conditions, and borderline childhood psychosis. J Autism Dev Disord. 1993;23:387-96.
  30. Piven J, Simon J, Chase GA, Wzorek M, Landa R, Gayle J, et al. The aetiology of autism: pre-, peri-and neonatal factors. J Am Acad Child Adolesc Psychiatry. 1993;32: 1256-63.
  31. Bolton PF, Murphy M, Macdonald H, Whitlock B, Pickles A, Rutter M. Obstetric complications in autism: consequences or causes of the condition? J Am Acad Child Adolesc Psychiatry. 1997;36:272-81.
  32. Deb S, Prasad KB, Seth H, Eagles JM. A comparison of obstetric and neonatal complications between children with autistic disorder and their siblings. J Intellect Disabil Res. 1997;41:81-6.
  33. Zambrino CA, Balottin U, Bettaglio E, Gerardo A, Lanzi G. Obstetrical suboptimality in autistic children: an Italian sample. J Autism Dev Disord. 1997;27:493-4.
  34. Burd L, Severud R, Kerbeshian J, Klug MG. Prenatal and perinatal risk factors for autism. J Perinat Med. 1999;27:441-50.
  35. Matsuishi T, Yamashita Y, Ohtani Y, Ornitz E, Kuriya N, Murakami Y, et al. Brief report: incidence of and risk factors for autistic disorder in neonatal intensive care unit survivors. J Autism Dev Disord. 1999;29:161-6.
  36. Juul-Dam N, Townsend J, Courchesne E. Prenatal, perinatal, and neonatal factors in autism, pervasive developmental disorder-not otherwise specified, and the general population. Pediatrics. 2001;107:E63.
  37. Eaton WW, Mortensen PB, Thomsen PH, Frydenberg M. Obstetric complications and risk for severe psychopathology in childhood. J Autism Dev Disord. 2001;31:279-85.
  38. Lauritsen MB, Mors O, Mortensen PB, Ewald H. Medical disorders among inpatients with autism in Denmark according to ICD-8: a nationwide register-based study. J Autism Dev Disord. 2002;32:115-19.
  39. Croen LA, Grether JK, Selvin S. Descriptive epidemiology of autism in a California population: who is at risk? J Autism Dev Disord. 2002;32:217-24.
  40. Hultman CM, Sparén P, Cnattingius S. Perinatal risk factors for infantile autism. Epidemiology. 2002;13:417-23.
  41. Wilkerson DS, Volpe AG, Dean RS, Titus JB. Perinatal complications as predictors of infantile autism. Int J Neurosci. 2002;112:1085-98.
  42. Courchesne E, Carper R, Akshoomoff N. Evidence of brain overgrowth in the first year of life in autism. JAMA. 2003;290:337-44.
  43. Glasson EJ, Bower C, Petterson B, de Klerk N, Chaney G, Hallmayer JF. Perinatal factors and the development of autism: a population study. Arch Gen Psychiatry. 2004;61:618-27.
  44. Torrey E, Dhavale D, Lawlor J, Yolken R. Autism and head circumference in the first year of life. Biol Psychiatry. 2004;56:892-4.
  45. Lauritsen MB, Pedersen CB, Mortensen PB. Effects of familial risk factors and place of birth on the risk of autism: a nationwide register-based study. J Child Psychol Psychiatry. 2005;46:963-71.
  46. Croen LA, Yoshida CK, Odouli R, Newman TB. Neonatal hyperbilirubinemia and risk of autism spectrum disorders. Pediatrics. 2005;115:e135-8.
  47. Croen LA, Grether JK, Yoshida CK, Odouli R, Van de Water J. Maternal autoimmune diseases, asthma and allergies, and childhood autism spectrum disorders: a case-control study. Arch Pediatr Adolesc Med. 2005;159:151-7.
  48. Beversdorf DQ, Manning SE, Hillier A, Anderson SL, Nordgren RE, Walters SE, et al. Timing of prenatal stressors and autism. J Autism Dev Disord. 2005;35:471-8.
  49. Sugie Y, Sugie H, Fukuda T, Ito M. Neonatal factors in infants with Autistic Disorder and typically developing infants. Autism. 2005;9:487-94.
  50. Stein D, Weizman A, Ring A, Barak Y. Obstetric complications in individuals diagnosed with autism and in healthy controls. Compr Psychiatry. 2006;47:69-75.
  51. Badawi N, Dixon G, Felix JF, Keogh JM, Petterson B, Stanley FJ, et al. Autism following a history of newborn encephalopathy: more than a coincidence? Dev Med Child Neurol. 2006;48:85-9.
  52. Wier ML, Yoshida CK, Odouli R, Grether JK, Croen LA. Congenital anomalies associated with autism spectrum disorders. Dev Med Child Neurol. 2006;48:500-7.
  53. Reichenberg A, Gross R, Weiser M, Bresnahan M, Silverman J, Harlap S, et al. Advancing paternal age and autism. Arch Gen pPsychiatry. 2006;63:1026-32.
  54. Guillem P, Cans C, Guinchat V, Ratel M, Jouk PS. Trends, perinatal characteristics, and medical conditions in pervasive developmental disorders. Dev Med Child Neurol. 2006;48:896-900.
  55. Brimacombe M, Ming X, Lamendola M. Prenatal and birth complications in autism. Matern Child Health J. 2007;11:73-9.
  56. Croen LA, Najjar DV, Fireman B, Grether JK. Maternal and paternal age and risk of autism spectrum disorders. Arch Pediatr Adolesc Med. 2007;161:334-40.
  57. Maimburg RD, Væth M. Do children born after assisted conception have less risk of developing infantile autism? Hum Reprod. 2007;22:1841-3.
  58. Brown GE, Jones SD, MacKewn AS, Plank EJ. An exploration of possible pre-and postnatal correlates of autism: a pilot survey. Psychol Rep. 2008;102:273-82.
  59. Williams K, Helmer M, Duncan GW, Peat JK, Mellis CM. Perinatal and maternal risk factors for autism spectrum disorders in New South Wales, Australia. Child Care Health Dev. 2008;34:249-56.
  60. Geier DA, Mumper E, Gladfelter B, Coleman L, Geier MR. Neurodevelopmental disorders, maternal Rh-negativity, and Rho(D) immune globulins: a multi-center assessment. Neuro Endocrinol Lett. 2008;29:272-80.
  61. Tripi G, Roux S, Canziani T, Bonnet Brilhault F, Barthélémy C, Canziani F. Minor physical anomalies in children with autism spectrum disorder. Early Hum Dev. 2008;84:217-23.
  62. Schendel D, Bhasin TK. Birth weight and gestational age characteristics of children with autism, including a comparison with other developmental disabilities. Pediatrics. 2008;121:1155-64.
  63. Croen LA, Matevia M, Yoshida CK, Grether JK. Maternal Rh D status, anti-D immune globulin exposure during pregnancy, and risk of autism spectrum disorders. Am J Obstet Gynecol. 2008;199:234.e1-6.
  64. Tsuchiya KJ, Matsumoto K, Miyachi T, Tsujii M, Nakamura K, Takagai S, et al. Paternal age at birth and high- functioning autistic-spectrum disorder in offspring. Br J Psychiatry. 2008;193:316-21.
  65. Maimburg RD, Vaeth M, Schendel DE, Bech BH, Olsen J, Thorsen P. Neonatal jaundice: a risk factor for infantile autism? Paediatr Perinat Epidemiol. 2008;22:562-8.
  66. Durkin MS, Maenner MJ, Newschaffer CJ, Lee LC, Cunniff CM, Daniels JL, et al. Advanced parental age and the risk of autism spectrum disorder. Am J Epidemiol. 2008;168:1268-76.
  67. Hack M, Taylor HG, Schluchter M, Andreias L, Drotar D, Klein N. Behavioral outcomes of extremely low birth weight children at age 8 years. J Dev Behav Pediatr. 2009;30: 122-30.
  68. Li J, Vestergaard M, Obel C, Christensen J, Precht DH, Lu M, et al. A nationwide study on the risk of autism after prenatal stress exposure to maternal bereavement. Pediatrics. 2009;123:1102-7.
  69. Dawson S, Glasson EJ, Dixon G, Bower C. Birth defects in children with autism spectrum disorders: a population-based, nested case-control study. Am J Epidemiol. 2009;169:1296-303.
  70. King MD, Fountain C, Dakhlallah D, Bearman PS. Estimated autism risk and older reproductive age. Am J Public Health. 2009;99:1673-9.
  71. Schendel DE, Autry A, Wines R, Moore C. The co-occurrence of autism and birth defects: prevalence and risk in a population-based cohort. Dev Med Child Neurol. 2009;51:779-86.
  72. Grether JK, Anderson MC, Croen LA, Smith D, Windham GC. Risk of autism and increasing maternal and paternal age in a large North American population. Am J Epidemiol. 2009;170:1118-26.
  73. Grether JK, Li SX, Yoshida CK, Croen LA. Antenatal ultrasound and risk of autism spectrum disorders. J Autism Dev Disord. 2010;40:238-45.
  74. Sasanfar R, Haddad SA, Tolouei A, Ghadami M, Yu D, Santangelo SM. Paternal age increases the risk for autism in an Iranian population sample. Mol Autism. 2010;1:2.
  75. Shelton JF, Tancredi DJ, Hertz-Picciotto I. Independent and dependent contributions of advanced maternal and paternal ages to autism risk. Autism Res. 2010;3:30-9.
  76. Johnson S, Hollis C, Kochhar P, Hennessy E, Wolke D, Marlow N. Autism spectrum disorders in extremely preterm children. J Pediatr. 2010;156:525-31.
  77. Mann JR, McDermott S, Bao H, Hardin J, Gregg A. Pre-eclampsia, birth weight, and autism spectrum disorders. J Autism Dev Disord. 2010;40:548-54.
  78. Burstyn I, Sithole F, Zwaigenbaum L. Autism spectrum disorders, maternal characteristics and obstetric complications among singletons born in Alberta, Canada. Chronic Dis Can. 2010;30:125-34.
  79. Karmel BZ, Gardner JM, Meade LS, Cohen IL, London E, Flory MJ, et al. Early medical and behavioral characteristics of NICU infants later classified with ASD. Pediatrics. 2010;126:457-67.
  80. Hultman CM, Sandin S, Levine SZ, Lichtenstein P, Reichenberg A. Advancing paternal age and risk of autism: new evidence from a population-based study and a meta-analysis of epidemiological studies. Mol Psychiatry. 2011;16:1203-12.
  81. Zhang X, Lv CC, Tian J, Miao RJ, Xi W, Hertz-Picciotto I, et al. Prenatal and perinatal risk factors for autism in China. J Autism Dev Disord. 2010;40:1311-21.
  82. Atlad óttir HO, Thorsen P, Østergaard L, Schendel DE, Lemcke S, Abdallah M, et al. Maternal infection requiring hospitalization during pregnancy and autism spectrum disorders. J Autism Dev Disord. 2010;40:1423-30.
  83. Grether JK, Croen LA, Anderson MC, Nelson KB, Yolken RH. Neonatally measured immunoglobulins and risk of autism. Autism Res. 2010;3:323-32.
  84. Burstyn I, Wang X, Yasui Y, Sithole F, Zwaigenbaum L. Autism spectrum disorders and fetal hypoxia in a population-based cohort: accounting for missing exposures via Estimation-Maximization algorithm. BMC Med Res Methodol. 2011;11:2.
  85. Haglund NG, Källén KB. Risk factors for autism and Asperger syndrome: perinatal factors and migration. Autism. 2011;15:163-83. 100.
  86. Dodds L, Fell DB, Shea S, Armson BA, Allen AC, Bryson S. The role of prenatal, obstetric and neonatal factors in the development of autism. J Autism Dev Disord. 2011;41:891-902. 101. Palo P, Erkkola R. Risk factors and deliveries associated with preterm, severely small for gestational age fetuses. Am J Perinatol. 1993;10:88-91. 102. Goldenberg RL, Andrews WW, Goepfert AR, Faye-Petersen O, Cliver SP, Carlo WA, et al. The Alabama Preterm Birth Study: umbilical cord blood Ureaplasma urealyticum and Mycoplasma hominis cultures in very preterm newborn infants. Am J Obstet Gynecol. 2008;198: 43 e1-5. 103. Sibai B, Dekker G, Kupferminc M. Pre-eclampsia. Lancet. 2005;365:785-99. 104. Limperopoulos C, Bassan H, Sullivan NR, Soul JS, Robertson RL Jr, Moore M, et al. Positive screening for autism in ex-preterm infants: prevalence and risk factors. Pediatrics. 2008;121:758-65. 105. Limperopoulos C, Bassan H, Gauvreau K, Robertson RL Jr, Sullivan NR, Benson CB, et al. Does cerebellar injury in premature infants contribute to the high prevalence of long-term cognitive, learning, and behavioral disability in survivors? Pediatrics. 2007;120:584-93. 106. Indredavik MS, Vik T, Evensen KA, Skranes J, Taraldsen G, Brubakk AM. Perinatal risk and psychiatric outcome in adolescents born preterm with very low birth weight or term small for gestational age. J Dev Behav Pediatr. 2010;31:286-94. 107. Zandi PP, Kalaydjian A, Avramopoulos D, Shao H, Fallin MD, Newschaffer CJ. Rh and ABO maternal-fetal incompatibility and risk of autism. Am J Med Genet B Neuropsychiatr Genet. 2006;141B:643-7. 108. Zwaigenbaum L, Szatmari P, Jones MB, Bryson SE, MacLean JE, Mahoney WJ, et al. Pregnancy and birth complications in autism and liability to the broader autism phenotype. J Am Acad Child Adolesc Psychiatry. 2002;41:572-9.

Cited by

Sorted by citations

Authors
GUINCHAT, V., THORSEN, P., LAURENT, C., CANS, C., BODEAU, N., & COHEN, D.
Affiliations
  • Pitié-Salpêtrière Hospital (FR)
  • Kolding Hospital (DK)
Corresponding author
GUINCHAT, VINCENT
Venue
Acta Obstetricia et Gynecologica Scandinavica
Publisher
Wiley
Published
2012-02-21
Volume
91
Issue
3
Pages
287-300
ISSN
  • 0001-6349 (ISSN-L)
  • 1600-0412
OpenAlex
W1901504499
Cited by
294
References
12
Citations by year
2026: 4 · 2025: 14 · 2024: 15 · 2023: 25 · 2022: 29 · 2021: 17 · 2020: 23 · 2019: 13 · 2018: 30 · 2017: 22 · 2016: 22 · 2015: 24 · 2014: 25 · 2013: 22 · 2012: 8
FWCI
1.52
Type
journal article
Language
en
Open access
Locations
  • Acta Obstetricia Et Gynecologica Scandinavica (publishedVersion)
  • PubMed (publishedVersion)
Funders
European Commission
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Maternal Mental Health During Pregnancy and Postpartum
  • Social Sciences › Psychology › Clinical Psychology › Family and Disability Support Research
Keywords
autism spectrum disorder, pervasive developmental disorders, risk factors, prenatal risk factors, perinatal risk factors, neonatal risk factors, advanced parental age, preterm birth, breech presentation, cesarean section, Apgar score, neonatal hyperbilirubinemia, congenital malformations, small for gestational age, preeclampsia, maternal diabetes, maternal infection, maternal stress, obstetric management
MeSH terms
Apgar Score, Birth Weight, Child Development Disorders, Pervasive, Female, Humans, Infant, Newborn, Obstetric Labor Complications, Pregnancy, Pregnancy Complications, Risk Factors, Delivery, Obstetric

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