Table 1 General characteristics of study participants 1
| Â | Lactating women | Controls | |||
|---|---|---|---|---|---|
|  | 2nd day (n = 199) | 7th day (n = 195) | 30th day (n = 196) | 90th day (n = 173) | (n = 58) |
Age (yrs) | |||||
– 20-25 | 47 | 44 | 36 | 39 | 4 |
– 26-30 | 125 | 124 | 129 | 112 | 36 |
– 31-35 | 26 | 26 | 30 | 21 | 16 |
– >35 | 1 | 1 | 1 | 1 | 2 |
Height (cm) | 160.2 ± 4.2 | 160.4 ± 4.1 | 160.1 ± 4.3 | 159.9 ± 4.0 | 159.0 ± 3.5 |
Weight (kg) | 60.1 ± 6.4b | 59.1 ± 6.6b | 58.6 ± 6.7b | 58.9 ± 5.5b | 52.9 ± 3.8a |
BMI (kg/M2) | 23.4 ± 2.0b | 22.9 ± 2.2b | 22.8 ± 2.1b | 23.0 ± 1.9b | 20.9 ± 1.1a |
First child | Yes | Yes | Yes | Yes | N/A |
Residence | |||||
– Local | 186(93.5) | 185(94.9) | 187(95.4) | 168(97.1) | 55(94.8) |
– Immigrant | 13(6.5) | 10(5.1) | 9(4.6) | 5(4.8) | 3(5.2) |
Ethnic group | |||||
– Han | 195(98.2) | 189(97.1) | 186(95.0) | 173(100) | 56(96.6) |
– Others | 4(1.8) | 6(2.9) | 10(5.0) | 0 | 2(3.4) |
Education | |||||
– Middle school | 25(12.5) | 15(7.5) | 20(10.0) | 23(13.3) | 7(11.9) |
– High school | 49(24.6) | 47(23.9) | 34(17.5) | 69(40.0) | 14(24.3) |
– College | 60(30.2) | 78(40.2) | 78(40.0) | 46(26.7) | 16(27.6) |
– University | 65 (32.7) | 55(28.4) | 64(32.5) | 35(20.0) | 21(36.2) |
Smoking | never | never | never | never | never |
Drinking | never | never | never | never | occasionally |
Regular exercise | no | no | yes | yes | yes |
Medication | no | no | no | no | no |