Table 1.
Comparison of characteristics of Chinese pregnant women
| Variable | N | Mean(95 % CI) μmol/L | F | P |
|---|---|---|---|---|
| Age | 6.78 | 0.03 | ||
| 15–25 | 490 | 1.68(1.63–1.74) | ||
| 25–35 | 663 | 1.65(1.47– 1.84) | ||
| 35–45 | 56 | 1.57(1.51 –1.62)* | ||
| Region strata | 6.62 | 0.08 | ||
| Large cities | 287 | 1.63(1.56 –1.71) | ||
| Small to medium cities | 360 | 1.67(1.60– 1.74) | ||
| General rural areas | 291 | 1.65(1.57–1.73) | ||
| Poor rural areas | 271 | 1.59(1.49–1.68) | ||
| College or university | 6.24 | 0.01 | ||
| No | 832 | 1.60(1.56 –1.65) | ||
| Yes | 377 | 1.70(1.63–1.76) | ||
| Income | 12.63 | 0.01 | ||
| < 10,000 | 199 | 1.58(1.52–1.63)* | ||
| 10,000–20,000 | 339 | 1.63(1.55– 1.71) | ||
| 20,000–30,000 | 486 | 1.64(1.54 –1.75) | ||
| > =30,000 | 185 | 1.77(1.68–1.86)* | ||
| Drinkers | 21.55 | 0.00 | ||
| No | 1071 | 1.65(1.61–1.69) | ||
| Yes | 138 | 1.52(1.40–1.64) | ||
| Smoking | 5.92 | 0.00 | ||
| Non-smoker without passive smoking | 553 | 1.67(1.61–1.72) | ||
| Non-smoker with passive smoking | 625 | 1.62(1.57–1.67) | ||
| Smokers | 31 | 1.26(0.98–1.53)* | ||
| Gestational age | 25.47 | 0.00 | ||
| First trimester | 471 | 1.74(1.68–1.80)* | ||
| Second trimester | 292 | 1.64(1.56–1.71) | ||
| Third trimester | 446 | 1.52(1.46–1.58)* | ||
| Parity | 7.66 | 0.02 | ||
| 0 | 877 | 1.70(1.62–1.79) | ||
| 1 | 299 | 1.62(1.58–1.66) | ||
| 2+ | 33 | 1.36(1.14–1.59)* | ||
| Anemia | 10.28 | 0.00 | ||
| No | 916 | 1.67(1.63–1.71) | ||
| Yes | 293 | 1.52(1.45–1.60) | ||
| Vitamin A supplement | 8.67 | 0.00 | ||
| No | 1104 | 1.62(1.58–1.66) | ||
| Yes | 105 | 1.80(1.67–1.91) |
*compared other group p < 0.05 was significant difference