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All cases were identified based on the ICD-9\/ICD-10 codes and classified based on co-occurring anomalies. Five controls without gastrointestinal congenital malformations matched for residence and time of conception (\u00b1\u20091 year) were randomly selected for each case. Maternal risk factors were analyzed with data from the same registers.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Total prevalence of CA was 0.45\/10,000, birth prevalence was 0.37\/10,000 and live birth prevalence was 0.36\/10,000. The overall prevalence trend did not change (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.11) during the study period. There were 15 (41.7%) isolated cases, 3 (8.3%) were associated with known syndromes and 18 (50.0%) had multiple congenital anomalies. Together there were 19.4% (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20097) terminations or neonatal mortalities. An association was observed with maternal diabetes and CA (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.03).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The prevalence of CA in Finland is low with no significant change over the study period. 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