Table 2 Association between the prevalence of anemia and socio-demographic characteristics among women in non-pregnancy, the first trimester and the third trimester
| Â | Non-pregnancy | First trimester | Third trimester | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Â | Number | Anemia,n(%) | aOR a (95%CI) | Number | Anemia,n(%) | aOR a (95%CI) | Number | Anemia,n(%) | aOR a (95%CI) |
All participants | 351,980 | 61,193(17.4) | - | 268,014 | 57,883(21.6) | - | 20,678 | 2178(10.5) | - |
Age group, years | |||||||||
 18–20 | 28,947 | 6113(21.1) | 1.28(1.24,1.32) | 25,464 | 6844(26.9) | 1.33(1.29,1.37) | 381 | 50(13.1) | 1.33(1.29,1.37) |
 21–25 | 117,023 | 20,395(17.4) | 1.03(1.01,1.05) | 102,668 | 21,982(21.4) | 1.00(0.98,1.03) | 3383 | 343(10.1) | 1.00(0.98,1.03) |
 26–30 | 110,488 | 17,968(16.3) | 1.00 | 91,018 | 18,672(20.5) | 1.00 | 9560 | 937(9.8) | 1.00 |
 31–35 | 51,325 | 8908(17.4) | 1.02(0.99 ,1.05) | 33,826 | 7199(21.3) | 1.03(0.99,1.06) | 5084 | 584(11.5) | 1.03(0.99,1.06) |
 > 35 | 44,197 | 7809(17.7) | 1.05(1.03,1.09) | 15,038 | 3186(21.2) | 1.01(0.97,1.06) | 2270 | 264(11.6) | 1.01(0.97,1.06) |
Occupation | |||||||||
 Worker | 26,243 | 3420(13.0) | 1.00 | 20,466 | 3308(16.2) | 1.00 | 4568 | 436(9.5) | 1.00 |
 Farmer | 310,898 | 55,732(17.9) | 1.34(1.29,1.40) | 236,570 | 52,695(22.3) | 1.38(1.33,1.44) | 9370 | 1140(12.2) | 1.38(1.33,1.44) |
 Others | 14,839 | 2041(13.8) | 1.02(0.96,1.08) | 10,978 | 1880(17.1) | 1.03(0.97,1.10) | 6740 | 602(8.9) | 1.03(0.97,1.10) |
Ethnic | |||||||||
 Han | 225,698 | 35,190(15.6) | 1.00 | 168,523 | 33,057(19.6) | 1.00 | 19,525 | 2050(10.5) | 1.00 |
 Others | 126,282 | 26,003(20.6) | 1.38(1.35,1.40) | 99,491 | 24,826(25.0) | 1.33(1.30,1.35) | 1153 | 128(11.1) | 1.33(1.30,1.35) |