| Total (N=11,031) | Drinking status 1 year after delivery | p valuea | ||||
---|---|---|---|---|---|---|---|
Non-drinkers (n=8626) | Drinkers (n=2405) | ||||||
n | (%) | n | (%) | n | (%) | ||
Educational attainment | Â | Â | Â | Â | Â | Â | <0.001 |
 University or higher | 3268 | (29.6) | 2602 | (30.2) | 666 | (27.7) |  |
 College | 4263 | (38.7) | 3367 | (39.0) | 896 | (37.3) |  |
 High school or lower | 3500 | (31.7) | 2657 | (30.8) | 843 | (35.0) |  |
Equivalent household income | Â | Â | Â | Â | Â | Â | 0.0073 |
 ≥4.00 million JPY | 2909 | (26.4) | 2271 | (26.3) | 638 | (26.5) |  |
 3.00–3.99 million JPY | 2068 | (18.7) | 1674 | (19.4) | 394 | (16.4) |  |
 2.00–2.99 million JPY | 3514 | (31.9) | 2712 | (31.5) | 802 | (33.4) |  |
 ≤1.99 million JPY | 2540 | (23.0) | 1969 | (22.8) | 571 | (23.7) |  |
Covariates | Â | Â | Â | Â | Â | Â | Â |
 Age |  |  |  |  |  |  | 0.13 |
  ≤29 years | 3226 | (29.2) | 2512 | (29.1) | 714 | (29.7) |  |
  30–34 years | 4211 | (38.2) | 3334 | (38.7) | 877 | (36.5) |  |
  ≥35 years | 3594 | (32.6) | 2780 | (32.2) | 814 | (33.9) |  |
 Multiparous | 5761 | (52.2) | 4327 | (50.2) | 1434 | (59.6) | <0.001 |
 Drinking during pregnancy | 701 | (6.4) | 357 | (4.1) | 344 | (14.3) | <0.001 |
 Working | 5815 | (52.7) | 4382 | (50.8) | 1433 | (59.6) | <0.001 |
 Postpartum depression | 1423 | (12.9) | 1114 | (12.9) | 309 | (12.9) | 0.93 |
 Breastfeeding | 6741 | (61.1) | 6053 | (70.2) | 688 | (28.6) | <0.001 |