Comparison of eligible mothers whose children were suitable for follow-up who either completed (responders) or did not complete follow-up (non-responders).

25OHD = 25-hydroxyvitamin D, pBMI = pre-pregnancy BMI, N = number of women with data available on a given covariate †P-value for difference between responders and non-responders, as tested by X2 for categorical variables and independent sample t-tests for continuous variables Comparison of eligible mothers whose children were suitable for follow-up who either completed (responders) or did not complete follow-up (non-responders).