Table 4 Background characteristics of the participants, 12 month olds (n = 140)
E-mail invitation (n = 65) | Postal invitation (n = 75) | pa | |
|---|---|---|---|
Infant’s gender, n (%) | 0.65 | ||
boy | 38 (58%) | 41 (55%) | |
girl | 27 (42%) | 34 (45%) | |
Geographical region, n (%) | 0.42 | ||
Oslo/Akershus | 10 (15%) | 19 (25%) | |
Hedmark/Oppland | 7 (11%) | 8 (11%) | |
South-Eastern Norway | 13 (20%) | 12 (16%) | |
Agder/Rogaland | 12 (18%) | 8 (11%) | |
Western Norway | 13 (20%) | 11 (15%) | |
Trøndelag | 5 (8%) | 5 (7%) | |
Northern Norway | 5 (8%) | 12 (16%) | |
Mother’s age, years, n (%) | 0.27 | ||
20–25 | 4 (6%) | 11 (15%) | |
26–30 | 20 (31%) | 27 (36%) | |
31–35 | 24 (37%) | 23 (31%) | |
≥36 | 17 (26%) | 14 (19%) | |
Employment prior to birth, mother, n (%)b | 0.31 | ||
Employed (full/part time) | 59 (91%) | 63 (85%) | |
Not working | 6 (9%) | 11 (15%) | |
Who filled in the questionnaire, n (%) | 0.49 | ||
Mother | 58 (89%) | 64 (85%) | |
Father/mother and father | 7 (11%) | 11 (15%) | |
Mother’s educational level, n (%)b | 0.08 | ||
High school or lower | 10 (16%) | 21 (28%) | |
College/university | 54 (84%) | 54 (72%) | |
Father’s educational level, n (%)c | 0.09 | ||
High school or lower | 28 (44%) | 43 (58%) | |
College/university | 36 (56%) | 31 (42%) |