TABLE 2.
Characteristics of participants according to means of plasma FR autoantibodies in Shanxi Province, China, 2011–2013 (N = 302)
| IgGa |
IgMa |
||||||
|---|---|---|---|---|---|---|---|
| Characteristics | N | Mean | SD | pb | Mean | SD | pb |
| Maternalage (years) | .163 | .280 | |||||
| <25 | 154 | −0.20 | 1.12 | 0.09 | 0.82 | ||
| 25–29 | 83 | −0.01 | 1.11 | 0.29 | 0.78 | ||
| 30–34 | 46 | 0.08 | 1.11 | 0.05 | 0.87 | ||
| >35 | 17 | 0.33 | 1.19 | 0.07 | 0.73 | ||
| Education | .338 | .766 | |||||
| Primary or lower | 21 | 0.21 | 1.25 | 0.12 | 0.80 | ||
| Junior high | 190 | −0.04 | 1.12 | 0.17 | 0.84 | ||
| High school or above | 91 | −0.23 | 1.10 | 0.08 | 0.76 | ||
| Occupation | .344 | .267 | |||||
| Farmer | 238 | −0.05 | 1.11 | 0.15 | 0.82 | ||
| Officer | 38 | 0.01 | 1.12 | 0.24 | 0.71 | ||
| Others | 26 | −0.38 | 1.09 | 0.23 | 0.93 | ||
| Prepregnancy BMI (kg/m2) | .220 | .918 | |||||
| <18.5 | 37 | −0.45 | 1.04 | 0.03 | 0.74 | ||
| 18.5–24.9 | 192 | −0.01 | 1.12 | 0.17 | 0.74 | ||
| >25 | 73 | −0.10 | 1.14 | 0.12 | 0.98 | ||
| Parity | .012 | .042 | |||||
| 1 | 147 | −0.22 | 1.16 | 0.06 | 0.81 | ||
| >2 | 138 | 0.13 | 1.09 | 0.25 | 0.81 | ||
| Periconceptional folate supplementation | .092 | .281 | |||||
| Yes | 158 | −0.06 | 1.06 | 0.14 | 0.77 | ||
| No | 141 | −0.08 | 1.19 | 0.15 | 0.87 | ||
a
IgG and IgM index were transformed using the natural logarithm. bANOVA to examine differences in means.