Characteristic | Intervention (n = 87) | Control (n = 84) |
---|---|---|
Age, mean (standard deviation) | ||
 Mother | 32.8 (3.9) | 33.0 (4.9) |
 Father | 34.8 (4.9) | 35.1 (5.8) |
Delivery history, n (%) | ||
 Primipara | 46 (53%) | 46 (55%) |
 Multipara | 41 (47%) | 38 (45%) |
Marital status, n (%) | ||
 Married | 86 (99%) | 83 (99%) |
 Unmarried couple | 1 (1%) | 1 (1%) |
Mother’s highest education level completed, n (%) | ||
 Middle/high school | 9 (11%) | 12 (14%) |
 Vocational school | 21 (24%) | 20 (24%) |
 Junior college | 20 (23%) | 20 (24%) |
 University | 35 (40%) | 30 (36%) |
 Graduate | 2 (2%) | 2 (2%) |
Number of children, n (%) | ||
 0 | 46 (53%) | 46 (55%) |
 1 | 32 (37%) | 30 (36%) |
 ≥ 2 | 9 (10%) | 8 (10%) |
Job status, n (%) | ||
 Mother | ||
  Unemployed | 38 (44%) | 39 (46%) |
  Full-time job | 35 (40%) | 36 (43%) |
  Part-time job | 14 (16%) | 8 (10%) |
 Father | ||
  Full-time job | 84 (97%) | 81 (96%) |
  Self-employed | 3 (3%) | 3 (4%) |
  Returned to work after maternity leave, n (%) | 46 (53%) | 46 (55%) |
Annual income (thousand yen), n (%) | ||
 < 2000 | 0 | 2 (2%) |
 2000–3999 | 10 (12%) | 9 (11%) |
 4000–5999 | 35 (42%) | 31 (37%) |
 6000–7999 | 17 (20%) | 24 (29%) |
 8000–9999 | 16 (19%) | 11 (13%) |
 ≥ 10,000 | 6 (7%) | 7 (8%) |