|
Characteristics
|
na
| |
na
| |
|
Maternal age at birth, years, mean (SD)
|
5670
|
30.2 (4.4) range: 16.8–44.5
|
1095
|
28.7 (5.1) range: 17.0–44.2
|
|
Maternal education, n (%)
|
2625
| |
392
| |
|
< 12 years (less than high school)
| |
116 (4.4)
| |
62 (15.8)
|
|
12–16 years (up to 4 years university)
| |
1298 (49.5)
| |
237 (60.5)
|
|
> 16 years (more than 4 years university)
| |
1211 (46.1)
| |
93 (23.7)
|
|
Mean incomeb, NOK, mean (SD)
|
5465
|
255,414 (29175)
|
1053
|
250,191 (30405)
|
|
Family history of allergyc, n (%)
|
5675
|
4200 (74.0)
|
1092
|
784 (71.8)
|
|
Older sibling, n (%)
|
3943
|
2245 (56.9)
|
731
|
401 (54.9)
|
|
Maternal smoking, n (%)
| | | | |
|
During pregnancy
|
2020
|
92 (4.6)
|
316
|
55 (17.4)
|
|
During child’s first 2 years
|
5638
|
887 (15.7)
|
1078
|
391 (36.3)
|
|
Paternal smoking, n (%)
|
5397
|
1072 (19.9)
|
994
|
330 (33.2)
|
|
Child exposed to smoke during first 2 yearsd, n (%)
|
5675
|
1462 (25.8)
|
1095
|
502 (45.8)
|
|
Petse, n (%)
|
5695
|
1143 (20.1)
|
1101
|
264 (24.0)
|
|
Birthweight, gram, mean (SD)
|
5625
|
3608 (552) range: 640–5560
|
1072
|
3463 (705) range: 585–5960
|
|
Birthweight < 2500 g, n (%)
|
5625
|
156 (2.8)
|
1072
|
88 (8.2)
|
|
Sex, male, n (%)
|
5693
|
2798 (49.2)
|
1101
|
581 (52.8)
|
|
Lower respiratory tract infection within first yearf, n (%)
|
3217
|
333 (10.4)
|
606
|
78 (12.9)
|
|
Antibiotic treatment within first year, n (%)
|
3746
|
756 (20.2)
|
695
|
163 (23.5)
|
|
Introduced to formula < 6 months of age, n (%)
|
5625
|
966 (17.2)
|
1093
|
972 (88.9)g
|
|
Start of day-care < 12 months of age, n (%)
|
5051
|
394 (7.8)
|
930
|
65 (7.0)
|
