Table 1 Characteristics of the study population (n = 1163)
Study cohort Number (%) | Used hormonal contraceptives before first birth | ||
|---|---|---|---|
% | p value | ||
Age | |||
35–36 years | 320 (15.4) | 49.1 | |
37–38 years | 273 (13.1) | 49.5 | |
39–40 years | 276 (13.3) | 42.4 | |
41–42 years | 296 (14.2 | 27.4 | |
43–44 years | 260 (12.5) | 20.4 | |
45–46 years | 296 (14.2) | 15.5 | |
4949 years | 357 (17.2) | 10.9 | p < 0.0001 |
Age at menarche | |||
< = 12 year | 538 (26.4) | 30.1 | |
13 years | 615 (30.2) | 35.5 | |
> = 14 years | 882 (43.3) | 26.6 | p = 0.001 |
Age at first birth | |||
<= 20 years | 503 (24.2) | 6.4 | |
21–25 years | 961 (46.3) | 25.6 | |
> = 26 years | 614 (29.5) | 57.0 | p<= 0.0001 |
Weight of newborn child | |||
-3000 g | 360 (18.0) | 31.4 | |
30001–3500 g | 750 (37.4) | 31.2 | |
3501–4000 g | 617 (30.8) | 28.4 | |
> = 4001 g | 276 (13.8) | 31.9 | P = 0.6 |
Education | |||
7–9 years | 428 (20.9) | 12.9 | |
10–12 years | 759 (37.2) | 24.2 | |
13–15 years | 517 (25.3) | 39.9 | |
> = 16 years | 339 (16.6) | 51.9 | p < 0.0001 |
Years between menarche and first birth | |||
0–5 years | 215(10.6) | 5.6 | |
6–10 years | 926(45.5) | 17.4 | |
11–15 years | 628 (30.9) | 43.0 | |
> = 16 years | 266 (13.1) | 64.7 | p < 0.0001 |
Number of births | |||
One | 307(14.8) | 46.3 | |
Two | 1044 (50.2) | 32.2 | |
Three | 543 (26.1) | 23.9 | |
> = Four | 184(8.9) | 10.9 | p < 0.0001 |
Smoking in the first pregnancy | |||
No | 1396 (69.6) | 30.5 | |
Yes | 611 (30.4) | 30.0 | p = 0.8 |