Table 1.
Baseline characteristics of mothers/infants allocated to the control group compared with the intervention group
| Variable | Control (n = 264)a % (count) or mean ± SD | Intervention (n = 269)b % (count) or mean ± SD | Total (n = 533)c % (count) or mean ± SD |
|---|---|---|---|
| Mother | |||
| Age (years) | 30.2 ± 4.1 | 30.9 ± 4.4 | 30.6 ± 4.3 |
| Not Norwegian as native language | 7.6 (20) | 5.9 (16) | 6.8 (36) |
| First-time mother (for infant participating in the survey) | 59.5 (157) | 57.2 (154) | 58.3 (311) |
| Marital status | |||
| Married | 35.6 (94) | 44.6 (120) | 40.2 (214) |
| Cohabitant | 62.1 (164) | 52.8 (142) | 57.4 (306) |
| Not married/cohabitant | 2.3 (6) | 2.6 (7) | 2.4 (13) |
| Education (College/university degree) | 82.0 (214) | 84.6 (225) | 83.3 (439) |
| Main activity (before pregnancy) | |||
| Working fulltime | 81.4 (214) | 81.6 (217) | 81.5 (431) |
| Working part time | 6.1 (16) | 6.4 (17) | 6.2 (33) |
| Student | 6.8 (18) | 7.5 (20) | 7.2 (38) |
| Other/Not working | 5.7 (15) | 4.5 (12) | 5.1 (27) |
| BMI (kg/mb) | 24.9 ± 4.2 | 24.9 ± 4.5 | 24.9 ± 4.4 |
| Smoking | 3.8 (10) | 3.3 (9) | 3.6 (19) |
| Use of snus | 4.9 (13) | 5.2 (14) | 5.1 (27) |
| Infant | |||
| Gender (female) | 50.4 (133) | 49.6 (133) | 49.9 (266) |
| Gestational age > 38 weeks | 91.3 (241) | 91.1 (245) | 91.2 (486) |
| Birth weight (g) | 3586 ± 513 | 3557 ± 472 | 3571 ± 492 |
| Weight at 5 months (g) | 7656 ± 924 | 7503 ± 887 | 7577 ± 907 |
| Exclusive breastfed first month | 67.4 (178) | 70.3 (189) | 68.9 (367) |
| Introduced to solid food before 4 months of age | 6.1 (16) | 4.1 (11) | 5.1 (27) |
a The total number of participants in the analyses vary between 219 and 264 because of missing data for some variables
b The total number of participants in the analyses vary between 236 and 269 because of missing data for some variables
c The total number of participants in the analyses vary between 455 and 533 because of missing data for some variables