Table 2.
Reproductive characteristics of 420 premenopausal Mongolian women (aged <44 years) born in and outside Ulaanbaatar (UB) and interviewed during April and May 2009
| Characteristic | Born in UB (n=178) n (%) | Not born in UB (n=242) n (%) | p valuea |
|---|---|---|---|
| Age at menarche (years) | NS | ||
| <14 | 36 (20.2) | 45 (18.6) | |
| 14 | 50 (28.1) | 53 (21.9) | |
| 15 | 35 (19.7) | 62 (25.6) | |
| 16 | 43 (24.2) | 54 (22.3) | |
| ≥17 | 14 (7.9) | 28 (11.6) | |
| Ever-use of hormonal contraception | 68 (38.2) | 126 (52.1) | 0.005 |
| Current use of hormonal contraception | 41 (23.0) | 65 (27.0) | NS |
| Tried to become pregnant for 12 months without success | 18 (10.2) | 19 (7.9) | NS |
| No. of pregnancies | NS | ||
| 1 | 26 (14.6) | 19 (7.9) | |
| 2 | 39 (21.9) | 57 (23.6) | |
| 3 | 39 (21.9) | 63 (26.0) | |
| 4 | 31 (17.4) | 46 (19.0) | |
| ≥5 | 43 (24.2) | 57 (23.6) | |
| No. of live births | 0.002 | ||
| 1 | 57 (32.0) | 53 (21.9) | |
| 2 | 78 (43.8) | 105 (43.4) | |
| 3 | 34 (19.1) | 54 (22.3) | |
| ≥4 | 9 (5.1) | 30 (12.4) | |
| Ever miscarried | 31 (17.4) | 36 (14.9) | NS |
| No. of induced abortions | NS | ||
| 0 | 79 (44.4) | 111 (45.9) | |
| 1 | 42 (23.6) | 73 (30.2) | |
| ≥2 | 57 (32.0) | 58 (24.0) | |
| Age at first live birth (years) | 0.019 | ||
| <21 | 64 (36.0) | 60 (24.8) | |
| 21–24 | 77 (43.3) | 119 (49.2) | |
| ≥25 | 37 (20.8) | 63 (26.0) | |
| Ever breastfed | 177 (99.4) | 239 (99.2) | NS |
| Total no. of months breastfed | 0.061 | ||
| 1–23 | 61 (35.1) | 66 (28.0) | |
| 24–47 | 56 (32.2) | 73 (30.9) | |
| ≥48 | 57 (32.8) | 97 (41.1) | |
| Missing data (n) | 3 | 3 | |
| Average no. of months breastfed each child | NS | ||
| <12 | 53 (28.0) | 66 (28.0) | |
| 12–23 | 65 (37.4) | 80 (33.9) | |
| ≥24 | 56 (32.2) | 90 (38.1) | |
| Weight of heaviest baby (g) | NS | ||
| ≤3250 | 67 (37.6) | 74 (30.6) | |
| 3251–3600 | 50 (28.1) | 98 (40.5) | |
| >3600 | 62 (34.3) | 70 (28.9) |
NS: not significant.
a The p value refers to the overall comparison among categories except for variables that are ordinal (age at menarche, no. of pregnancies, no. of live births, no. of induced abortions, age at first live birth, no. of months breastfed, average no. of months breastfed, weight of heaviest baby).