Table 5.

Binary logistic regression results of factors related to periconceptional folic acid use based on the survey after (2011–2012) the massive folic acid supplementation programme, Shanxi Province and Jiangsu Province, China

Variable	OR	95 % CI
BMI (≥25 v. <25 kg/m2*)	1·64	1·06, 2·51
Education (senior v. junior high school or less*)	3·66	2·50, 5·37
Residence (urban v. rural*)	2·64	1·81, 3·85
NTD prevalence (low v. high*)	1·92	1·33, 2·77

NTD, neural tube defect.

Note: Adjusted for maternal age, BMI, education, residence, previous pregnancy experience, prevalence of NTD.

*Reference group.