Table 3 Characteristics of folic acid supplementation by sex of infant in northern China
Characteristics | N | Women with male infants | Women with female infants | P-value |
|---|---|---|---|---|
Folic acid supplementation (Months) | 18,201 | 5.5(2.4) | 5.5(2.4) | 0.180 |
Timing | 0.369 | |||
 Periconception | 12,779 | 70.5 | 70.4 |  |
 Preconception | 3623 | 20.1 | 19.8 |  |
 Postconception | 1714 | 9.7 | 9.4 |  |
Compliance | 0.190 | |||
 < 80% | 3310 | 17.9 | 18.6 |  |
 ≥80% | 14,839 | 82.1 | 81.4 |  |