Table 5.
Prevalence of anemia in different characteristics among women of reproductive age, stratified by the history of childbirth in 2014–2018, southwest China
| Without history of childbirth | With history of childbirth | |||||||
|---|---|---|---|---|---|---|---|---|
| Number | Anemia,n(%) | cOR(95%CI) | aORa(95%CI) | Number | Anemia,n(%) | cOR(95%CI) | aORa(95%CI) | |
| All participants | 253,906 | 46,062(18.1) | - | - | 386,766 | 75,192(19.4) | - | - |
| Stage | ||||||||
| Non-pregnancy | 113,575 | 17,957(15.8) | 1.00 | 1.00 | 238,405 | 43,236(18.1) | 1.00 | 1.00 |
| First trimester | 126,543 | 26,705(21.1) | 1.42(1.40,1.45) | 1.41(1.38,1.44) | 141,471 | 31,178(22.0) | 1.28(1.26,1.30) | 1.27(1.25,1.29) |
| Third trimester | 13,788 | 1400(10.2) | 0.60(0.57,0.64) | 0.77(0.72,0.81) | 6890 | 778(11.3) | 0.58(0.53,0.62) | 0.69(0.64,0.75) |
| Age group, years | ||||||||
| 18–20 | 32,301 | 7907(24.5) | 1.60(1.55,1.65) | 1.37(1.33,1.41) | 22,491 | 5100(22.7) | 1.23(1.18,1.27) | 1.21(1.17,1.25) |
| 21–25 | 119,045 | 21,490(18.1) | 1.04(1.01,1.06) | 0.98(0.96,1.01) | 104,029 | 21,230(20.4) | 1.06(1.03,1.08) | 1.05(1.03,1.07) |
| 26–30 | 79,903 | 12,537(15.7) | 1.00 | 1.00 | 131,163 | 25,040(19.1) | 1.00 | 1.00 |
| 31–35 | 16,388 | 2921(17.8) | 1.07(1.02,1.13) | 1.18(1.12,1.24) | 73,847 | 13,770(18.6) | 0.95(0.93,0.98) | 0.99(0.96,1.01) |
| > 35 | 6269 | 1207(19.3) | 1.17(1.10,1.25) | 1.25(1.17,1.33) | 55,236 | 10,052(18.2) | 0.93(0.91,0.95) | 1.00(0.98,1.03) |
| Occupation | ||||||||
| Worker | 30,935 | 3767(12.2) | 1.00 | 1.00 | 20,342 | 3397(16.7) | 1.00 | 1.00 |
| Farmer | 204,768 | 40,130(19.6) | 1.76(1.70,1.82) | 1.76(1.70,1.82) | 352,070 | 69,437(19.7) | 1.23(1.18,1.27) | 1.13(1.09,1.17) |
| Others | 18,203 | 2165(11.9) | 0.97(0.92,1.03) | 0.97(0.92,1.03) | 14,354 | 2358(16.4) | 0.98(0.93,1.04) | 0.99(0.93,1.05) |
| Ethnic | ||||||||
| Han | 171,560 | 28,353(16.5) | 1.00 | 1.00 | 242,186 | 41,944(17.3) | 1.00 | 1.00 |
| Others | 253,906 | 17,709(21.5) | 1.38(1.36,1.41) | 1.28(1.26,1.31) | 144,580 | 33,248(23.0) | 1.43(1.40,1.45) | 1.39(1.37,1.41) |
aMultivariate model adjusted for pregnancy stage, age, occupation, ethnic and investigation year among women of reproductive age
The stage was taken as the reference by non-pregnancy, the age was taken as the reference by the age group of 26–30 years, the occupation was taken as the reference by workers, and the ethnic was taken as the reference by the Han