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Previous studies examining this were limited by reliance on clinical samples and exclusion of children with severe motor deficits.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To examine in a population\u2010based sample if age of walking is differentially related to intellectual ability in children with ASD versus other neurodevelopmental disorders (NDD).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Participants were from the nested Autism Birth Cohort Study of the Norwegian Mother, Father and Child Cohort Study (MoBa). Cox proportional hazards regression assessed if diagnosis (ASD\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u00a0212 vs. NDD\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u00a0354), continuous nonverbal IQ, and their interaction, were associated with continuous age of walking.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The relationship between nonverbal IQ and age of walking was stronger for NDD than for ASD (Group\u00a0\u00d7\u00a0nonverbal IQ interaction, \u03c7\n                      <jats:sup>2<\/jats:sup>\n                      \u00a0=\u00a013.93,\n                      <jats:italic>p<\/jats:italic>\n                      \u00a0=\u00a0.0002). This interaction was characterized by a 21% decrease in the likelihood of walking onset at any given time during the observation period per 10\u2010point decrease in nonverbal IQ (hazard ratio\u00a0=\u00a00.79, 95% CI: 0.78\u20130.85) in the NDD group compared to 8% (hazard ratio\u00a0=\u00a00.92, 95% CI: 0.86\u20130.98) in the ASD group.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The finding that age of walking is less strongly related to low intellectual ability in children with ASD than in children without other NDDs supports the hypothesis that ID in ASD may result from heterogeneous developmental pathways. Late walking may be a useful stratification variable in etiological research focused on ASD and other NDDs.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jcpp.13369","type":"journal-article","created":{"date-parts":[[2020,12,28]],"date-time":"2020-12-28T12:42:20Z","timestamp":1609159340000},"page":"1070-1078","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Age of walking and intellectual ability in autism spectrum disorder and other neurodevelopmental disorders: a population\u2010based study"],"prefix":"10.1111","volume":"62","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9268-0423","authenticated-orcid":false,"given":"Alexandra","family":"Havdahl","sequence":"first","affiliation":[{"name":"Nic Waals Institute Lovisenberg Diaconal Hospital Oslo Norway"},{"name":"Norwegian Institute of Public Health Oslo Norway"},{"name":"MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School University of Bristol Bristol UK"},{"name":"PROMENTA Research Center, Department of Psychology University of Oslo Oslo Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cristan","family":"Farmer","sequence":"additional","affiliation":[{"name":"Pediatrics &amp; Developmental Neuroscience Branch National Institute of Mental Health Bethesda MD USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Synnve","family":"Schj\u00f8lberg","sequence":"additional","affiliation":[{"name":"Norwegian Institute of Public Health Oslo Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anne\u2010Siri","family":"\u00d8yen","sequence":"additional","affiliation":[{"name":"Nic Waals Institute Lovisenberg Diaconal Hospital Oslo Norway"},{"name":"Norwegian Institute of Public Health Oslo Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P\u00e5l","family":"Sur\u00e9n","sequence":"additional","affiliation":[{"name":"Norwegian Institute of Public Health Oslo Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ted","family":"Reichborn\u2010Kjennerud","sequence":"additional","affiliation":[{"name":"Norwegian Institute of Public Health Oslo Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Per","family":"Magnus","sequence":"additional","affiliation":[{"name":"Norwegian Institute of Public Health Oslo Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michaeline","family":"Bresnahan","sequence":"additional","affiliation":[{"name":"New York State Psychiatric Institute Columbia University Medical Center New York NY USA"},{"name":"Department of Epidemiology Mailman School of Public Health New York NY USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mady","family":"Hornig","sequence":"additional","affiliation":[{"name":"Department of Epidemiology Mailman School of Public Health New York NY USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ezra","family":"Susser","sequence":"additional","affiliation":[{"name":"New York State Psychiatric Institute Columbia University Medical Center New York NY USA"},{"name":"Department of Epidemiology Mailman School of Public Health New York NY USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W. 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