Table 2. Factors are associated with serum folate of pregnant women — China, 2015.
| Risk factors | LSMEAN (ng/mL) | SE | Pr>|t| |
| Abbreviation: BMI=body mass index; LSMEAN=least squares means; SE=standard error.
*Junior high and below: include that do not receive formal school education; do not graduate from primary school; graduate from primary school; graduate from junior high school. Senior high/college: include high school; technical secondary school; technical school; graduate from college. University and above: include that graduated from the university, get a master degree, or above. | |||
| Residence | |||
| Urban | 10.37 | 0.27 | |
| Rural | 9.88 | 0.28 | <0.001 |
| Region | |||
| Northern region | 9.10 | 0.27 | |
| Southern region | 11.14 | 0.28 | <0.001 |
| Supplementation frequency in the past week (days) | |||
| ≤3 | 9.38 | 0.28 | |
| 3–6 | 10.11 | 0.32 | <0.001 |
| 7 | 10.87 | 0.27 | <0.001 |
| Gestational weeks | |||
| <12 | 11.13 | 0.29 | |
| 13–27 | 10.05 | 0.28 | <0.001 |
| ≥28 | 9.18 | 0.28 | <0.001 |
| Season | |||
| Spring | 8.76 | 0.20 | |
| Summer | 12.07 | 0.97 | <0.001 |
| Autumn | 10.01 | 0.18 | <0.001 |
| Winter | 9.63 | 0.13 | <0.001 |
| BMI | |||
| ≤18.5 | 10.99 | 0.39 | 0.002 |
| 18.5–23.9 | 10.04 | 0.27 | |
| 24.0–27.9 | 9.78 | 0.28 | <0.074 |
| ≥28.0 | 9.66 | 0.30 | <0.041 |
| Age (years) | |||
| <25 | 9.56 | 0.28 | |
| 25–34 | 10.16 | 0.26 | <0.001 |
| ≥35 | 10.54 | 0.33 | <0.001 |
| Education* | |||
| Junior high and below | 9.44 | 0.28 | |
| Senior high/college | 10.01 | 0.28 | <0.001 |
| University and above | 10.91 | 0.29 | <0.001 |