Table 1 Association between rural Chinese women’s sociodemographic characteristics and folic acid use
Number of Participants N (%) | Use of folic acid N (%) | Crude odds ratio (95% CI) | Adjusted odds ratio (95% CI) | |
|---|---|---|---|---|
All | 907,720 (100.00) | 682,315 (75.62) | ||
Age (years) | ||||
21–30 | 359,024 (39.79) | 556,948 (75.87) | 1.000 | 1.000 |
31–39 | 375,056 (41.57) | 119,678 (74.86) | 0.95 (0.94,0.96) | 1.00 (0.99,1.02) |
41–49 | 126,992 (14.07) | 5689 (68.44) | 0.69 (0.66,0.72) | 0.81 (0.77,0.85) |
Years of education | ||||
≤ 6 | 38,456 (4.26) | 29,323 (76.25) | 1.000 | 1.000 |
7–11 | 574,818 (63.71) | 423,811 (73.73) | 0.87 (0.85,0.90) | 0.86 (0.83,0.88) |
≥ 12 | 279,261 (30.95) | 222,951 (79.84) | 1.23 (1.20,1.27) | 1.03 (1.00,1.06) |
Missing | 9735 (1.08) | 6230 (64) | 0.55 (0.53,0.58) | |
Ethnicity | ||||
others | 46,488 (5.15) | 31,657 (68.1) | 1.000 | 1.000 |
Han | 850,661 (94.28) | 647,764 (76.15) | 1.50 (1.47,1.53) | 1.182 (1.15,1.22) |
Missing | 5121(0.57) | 2894 (56.51) | 0.61 (0.57,0.65) | |
Occupation | ||||
farmer | 674,647 (74.77) | 505,465 (74.92) | 1.000 | 1.000 |
worker | 86,484 (9.59) | 65,457 (75.69) | 1.04 (1.03,1.06) | 0.89 (0.87,0.92) |
others | 125,406 (13.90) | 100,770 (80.36) | 1.37 (1.35,1.40) | 1.02 (1.00,1.05) |
Missing | 15,733 (1.74) | 10,623 (67.52) | 0.700 (0.67,0.72) | |
Time at study recruitment | ||||
2010 | 183,893 (20.26) | 134,131 (73.58) | 1.000 | 1.000 |
2011 | 436,761 (48.11) | 329,288 (75.88) | 1.13 (1.12,1.14) | 1.25 (1.23,1.27) |
2012 | 287,175 (31.63) | 218,896 (76.53) | 1.17 (1.16,1.19) | 1.24 (1.22,1.26) |