Models of categories of 25OHD serum data.

t statistics in parentheses.
**p<0.0001,
*p<0.001.
The first column (“”) is the same as model (3) in table 1. The remaining four columns give regression coefficients for the same model specification, using the category-specific subsets of the data (as indicated in ng/mL) as the dependent variable. The lag of airmass was independently identified for each model, but was always 8 weeks, except for 25OHD ng/mL, for which the lag was 3 weeks.