Table 1 Sociodemographic and obstetric characteristics of the total sample at baseline (N = 251)
|  | Total | Intervention group n = 120 | Control group n = 131 | P-value |
|---|---|---|---|---|
| Â | N (%) | Mean (SD) | Mean (SD) | Â |
Age | 251 (100) | 31.33 (4.67) | 31.69 (4.84) | 0.557 |
Gestational age | 251 (100) | 27.83 (6.48) | 29.76 (7.04) | 0.024 |
|  |  | Median (min–max) | Median (min–max) |  |
Weeks after birth at follow-up | 251 (100) | 15 (6–58) | 16 (6–56) | 0.847 |
| Â | N (%) | n (%) | n (%) | Â |
Civil status | Â | Â | Â | 0.836 |
Married/cohabiting | 224 (89.2) | 106 (88.3) | 118 (90.1) | Â |
Single | 16 (6.4) | 8 (6.7) | 8 (6.1) | Â |
Missing | 11 (4.4) | 6 (5.0) | 5 (3.8) | Â |
Level of education | Â | Â | Â | 0.873 |
 ≤ High school | 89 (35.5) | 44 (36.7) | 45 (34.4) |  |
College/university  < 4 years | 77 (30.6) | 35 (29.2) | 42 (32.1) |  |
College/university  ≥ 4 years | 83 (33.1) | 40 (33.3) | 43 (32.7) |  |
Missing | 2 (0.8) | 1 (0.8) | 1 (0.8) | Â |
Employment status | Â | Â | Â | 0.325 |
Working/studying | 193 (76.9) | 89 (74.2) | 104 (79.4) | Â |
Unemployed | 56 (22.3) | 30 (25) | 26 (19.8) | Â |
Missing | 2 (0.8) | 1 (0.8) | 1 (0.8) | Â |
Joint family income last year | Â | Â | Â | 0.650 |
 ≤ NOK 599,000 | 57 (22.7) | 31 (25.8) | 26 (19.8) |  |
NOK 600–999,000 | 109 (43.4) | 52 (43.3) | 57 (43.5) |  |
 ≥ NOK 1,000,000 | 60 (23.9) | 26 (21.7) | 34 (26) |  |
Do not know | 23 (9.2) | 10 (8.4) | 13 (9.9) | Â |
Missing | 2 (0.8) | 1 (0.8) | 1 (0.8) | Â |
Mother tongue | Â | Â | Â | 0.370 |
Norwegian | 190 (75.7) | 88 (73.4) | 102 (77.8) | Â |
Somali | 3 (1.2) | 0 | 3 (2.3) | Â |
Urdu | 4 (1.6) | 2 (1.7) | 2 (1.5) | Â |
English | 2 (0.8) | 1 (0.8) | 1 (0.8) | Â |
Other | 50 (19.9) | 28 (23.3) | 22 (16.8) | Â |
Missing | 2 (0.8) | 1 (0.8) | 1 (0.8) | Â |
Parity | Â | Â | Â | 0.280 |
Nulliparous | 124 (49.4) | 55 (45.8) | 69 (52.6) | Â |
Multiparous | 125 (49.8) | 64 (53.4) | 61 (46.6) | Â |
Missing | 2 (0.8) | 1 (0.8) | 1 (0.8) | Â |
Tobacco use | Â | Â | Â | 0.454 |
Yes | 12 (4.8) | 7 (5.8) | 5 (3.8) | Â |
No | 239 (95.2) | 113 (94.2) | 126 (96.2) | Â |
Negative experiences with alcohol consumption (woman) | Â | Â | Â | 0.381 |
Yes | 34 (13.5) | 14 (11.7) | 20 (15.3) | Â |
No | 217 (82.5) | 102 (85) | 105 (80.1) | Â |
Missing | 10 (4) | 4 (3.3) | 6 (4.6) | Â |
Negative experiences with alcohol consumption (partner) | Â | Â | Â | 0.996 |
Yes | 36 (14.3) | 17 (14.2) | 19 (14.5) | Â |
No | 201 (80.1) | 95 (79.1) | 106 (80.9) | Â |
Missing | 14 (5.6) | 8 (6.7) | 6 (4.6) | Â |
Maternal and child health centre | Â | Â | Â | 0.131 |
Small (< 100) | 29 (11.6) | 9 (7.5) | 20 (15.3) |  |
Medium (100–300) | 60 (23.9) | 28 (23.3) | 32 (24.4) |  |
Large (> 300) | 162 (64.5) | 83 (69.2) | 79 (60.3) |  |