{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,9,9]],"date-time":"2024-09-09T21:10:11Z","timestamp":1725916211316},"reference-count":30,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2008,5,21]],"date-time":"2008-05-21T00:00:00Z","timestamp":1211328000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Birth Defects Research"],"published-print":{"date-parts":[[2008,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:bold>BACKGROUND:<\/jats:bold> In many regions, NTD prevalences were already declining prior to folic acid fortification. This study examined whether the declining prefortification (1989\u20131996) NTD prevalences continued into the postfortification period (1998\u20132003) in selected California counties. <jats:bold>METHODS:<\/jats:bold> This population\u2010based study used vital statistics data and birth defects registry data that were actively ascertained from medical records. The study population included all live births and stillbirths delivered in central California counties from 1989 to 2003. Cases included deliveries with NTDs during the same time period. <jats:bold>RESULTS:<\/jats:bold> For all NTDs combined, the slopes indicated that NTD prevalence was decreasing by 7.5 (slope: \u22127.5; 95% CI: \u221212.4, \u22122.5) cases per 100,000 deliveries per year before fortification, whereas NTD prevalence was no longer decreasing after fortification. Comparison of the difference in the two slopes indicated that the postfortification slope exceeded the prefortification slope by 12.6 (95% CI: 2.6, 22.6) cases per 100,000 deliveries per year. <jats:bold>CONCLUSIONS:<\/jats:bold> Annual NTD prevalences in central California did not continue to decrease after implementation of folic acid fortification. 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