Table 6.
Crude and adjusted linear coefficients for maternal report of folic acid use and plasma levels of folate, N=2911.
| Model 1 | Model 2a) | ||||||
|---|---|---|---|---|---|---|---|
| N | B | 95 % CI | B | 95 % CI | |||
| Folic acid no/yes | |||||||
| Start w -4-0 | 500 | 7.032 | 6.13 | 7.51 | 6.038 | 5.09 | 6.98 |
| Start w 0-4 | 413 | 6.589 | 5.63 | 7.92 | 5.820 | 4.83 | 6.80 |
| Start w 5-8 | 551 | 6.123 | 5.25 | 7.54 | 5.495 | 4.59 | 6.39 |
| Start w 9-12 | 301 | 4.525 | 3.46 | 6.99 | 3.845 | 2.74 | 4.93 |
| Start w 13-17 | 302 | 8.906 | 7.84 | 9.97 | 8.013 | 6.91 | 9.10 |
|
| |||||||
| Folic acid in every four week period | |||||||
| w -4 to 17 | 238 | 6.005 | 4.87 | 7.13 | 5.104 | 3.95 | 6.24 |
|
| |||||||
| Folic acid in every four week period | |||||||
| w -4 to 12 | 351 | 3.647 | 2.68 | 4.60 | 2.760 | 1.78 | 3.73 |
Folic acid use dichotomized. Linear regression was used to determine the coefficients for folate plasma levels (subjects with no folic acid supplement use as reference, B=0).
a)
Adjusted for education, age, planned pregnancy, BMI and smoking.