| Total | Pregnancy intention |  | |
---|---|---|---|---|
 |  | Unintended | Intended |  |
 | N = 2076 | N = 525 (25.3%) | N = 1551 (74.7%) | P value |
Maternal age (years) | 31.3 ± 3.7 | 30.0 ± 4.2 | 31.5 ± 3.5 | 0.0228 |
Paternal age (years) | 33.9 ± 4.0 | 33.8 ± 4.6 | 33.9 ± 3.8 | 0.5571 |
Infant’s sex |  |  |  |  |
Boy | 1056 (50.9) | 262 (49.9) | 794 (51.2) | 0.6099 |
Girl | 1020 (49.1) | 263 (50.1) | 757 (48.8) | Â |
Infant’s birth order |  |  |  |  |
First born | 984 (47.5) | 200 (38.1) | 784 (50.7) | <0.0001 |
Later born | 1087 (52.5) | 325 (61.9) | 762 (49.3) | Â |
Maternal education | Â | Â | Â | Â |
University or over | 829 (40.2) | 193 (37.1) | 635 (41.2) | 0.0268§ |
Junior college | 589 (28.6) | 144 (27.7) | 445 (28.9) | Â |
High school or under | 643 (31.2) | 183 (35.2) | 460 (29.9) | Â |
Paternal education | Â | Â | Â | Â |
University or over | 1003 (50.4) | 234 (46.4) | 769 (51.7) | 0.0356§ |
Junior college | 420 (21.1) | 111 (22.0) | 309 (20.8) | Â |
High school or under | 568 (28.5) | 159 (31.6) | 409 (27.5) | Â |
Maternal occupation | Â | Â | Â | Â |
Non-manual | 516 (25.2) | 127 (24.4) | 389 (25.5) | 0.5975 |
Manual | 113 (5.5) | 33 (6.4) | 80 (5.3) | Â |
Housewife/others | 1415 (69.2) | 360 (69.2) | 1055 (69.2) | Â |
Paternal occupation | Â | Â | Â | Â |
Non-manual | 1261 (65.6) | 299 (61.8) | 962 (66.8) | 0.0421 |
Manual | 662 (34.4) | 185 (38.2) | 477 (33.2) | Â |
Household income quintiles | Â | Â | Â | Â |
I (highest) | 411 (19.9) | 89 (17.1) | 322 (20.9) | 0.0002§ |
II | 445 (21.6) | 95 (18.2) | 350 (22.7) | Â |
III | 394 (19.1) | 100 (19.2) | 294 (19.1) | Â |
IV | 377 (18.3) | 104 (19.9) | 273 (17.7) | Â |
V (lowest) | 436 (21.1) | 134 (25.7) | 302 (19.6) | Â |
Maternal smoking | Â | Â | Â | Â |
No | 2059 (99.2) | 519 (98.9) | 1540 (99.3) | 0.399* |
Yes | 17 (0.8) | 6 (1.1) | 11 (0.7) | Â |
Paternal smoking | Â | Â | Â | Â |
No | 1174 (56.6) | 263 (50.1) | 911 (58.7) | 0.0006 |
Yes | 902 (43.5) | 262 (49.9) | 640 (41.3) | Â |
Maternal alcohol consumption | Â | Â | Â | Â |
No | 1359 (73.0) | 347 (72.4) | 1012 (73.2) | 0.7388 |
Yes | 502 (27.0) | 132 (27.6) | 370 (26.8) | Â |
Paternal alcohol consumption | Â | Â | Â | Â |
No | 367 (21.4) | 100 (22.5) | 267 (21.0) | 0.4931 |
Yes | 1350 (78.6) | 344 (77.5) | 1006 (79.0) | Â |