Table 1.
Characteristics of participants: the Tohoku Medical Megabank Project Birth and Three-Generation Cohort Study
| Total (N=11,031) | Drinking status 1 year after delivery | p valuea | |||||
|---|---|---|---|---|---|---|---|
| Non-drinkers (n=8626) | Drinkers (n=2405) | ||||||
| n | (%) | n | (%) | n | (%) | ||
| Educational attainment | <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 | 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 | |||||||
| 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 |
JPY, Japanese yen
aObtained using the chi-square test, comparing non-drinkers and drinkers