Table 1 Description of the main cohort, n = 7898
| Â | Â | N (%) | HR (95Â % CI)a | |
|---|---|---|---|---|
Nasal anti-allergics | Oral antihistamine | |||
1st purchase | 1st purchase | |||
Sex | Girl | 3784 (49) | 1.0 | 1.0 |
Boy | 3996 (51) | 1.40 (1.04–1.90) | 1.03 (0.95–1.12) | |
Missing | 118 | Â | Â | |
Birth weight | 2500–4000 (normal) | 6079 (78) | 1.0 | 1.0 |
500–2499 (low) | 301 (4) | 1.38 (0.70–2.71) | 0.98 (0.78–1.22) | |
4001–6500 (high) | 1396 (18) | 0.95 (0.64–1.41) | 1.02 (0.91–1.13) | |
Missing | 122 | Â | Â | |
Smoking during pregnancy | No | 7275 (94) | 1.0 | 1.0 |
Yes | 499 (6) | 1.07 (0.61–1.88) | 1.08 (0.92–1.27) | |
Missing | 124 | Â | Â | |
Environmental tobacco smoke | No | 6591 (85) | 1.0 | 1.0 |
Yes | 1177 (15) | 0.89 (0.58–1.36) | 0.97 (0.86–1.09) | |
Missing | 130 | Â | Â | |
Breastfeeding | ≥8 months | 3920 (56) | 1.0 | 1.0 |
<8 months | 2807 (40) | 0.91 (0.67–1.24) | 1.19 (1.09–1.30) | |
Never breastfed | 278 (4) | 0.79 (0.32–1.95) | 1.08 (0.86–1.36) | |
Missing | 893 | Â | Â | |
Parental allergy | No | 3177 (46) | 1.0 | 1.0 |
Yes | 3751 (54) | 1.18 (0.86–1.62) | 1.14 (1.05–1.25) | |
Missing | 970 | Â | Â | |
Furred pets at home | No | 5790 (75) | 1.0 | 1.0 |
Yes | 1922 (25) | 1.12 (0.80–1.56) | 1.13 (1.03–1.25) | |
Missing | 186 | Â | Â | |
Mold at home | No | 7326 (95) | 1.0 | 1.0 |
Yes | 386 (5) | 1.26 (0.69–2.32) | 0.99 (0.81–1.20) | |
Missing | 186 | Â | Â | |
Problems to pay bills | Never or seldom | 7361 (96) | 1.0 | 1.0 |
Yes, >6 months/year | 348 (5) | 0.84 (0.40–1.80) | 0.92 (0.75–1.14) | |
Missing | 189 | Â | Â | |
Swedish parents | Yes, both Swedish | 297 (4) | 1 | 1.0 |
One foreign | 1792 (23) | 1.03 (0.68–1.55) | 0.93 (0.83–1.04) | |
Both foreign | 5612 (73) | 1.16 (0.81–1.66) | 0.80 (0.72–0.89) | |
Missing | 197 | Â | Â | |
Highest education any parent | >12Â years | 297 (4) | 1.0 | 1.0 |
10–12 years | 1792 (23) | 1.14 (0.48–2.68) | 1.13 (0.89–1.44) | |
≤9 years | 5612 (73) | 1.22 (0.54–2.76) | 1.16 (0.92–1.47) | |
Missing | Â | Â | Â | |
Type of housing | Owned house | 2384 (36) | 1.0 | 1.0 |
Tenant-owned apartment | 2242 (29) | 0.69 (0.47–1.01) | 0.93 (0.84–1.03) | |
Rented apartment | 2616 (34) | 0.84 (0.60–1.18) | 0.86 (0.78–0.95) | |
Other | 101 (1) | --- | 1.14 (0.80–1.61) | |
Missing | 156 | Â | Â | |
Municipality | Vellinge | 449 (6) | 1.0 | 1.0 |
Svedala | 664 (8) | 0.70 (0.35–1.42) | 1.25 (1.01–1.53) | |
Trelleborg | 611 (8) | 0.65 (0.39–1.08) | 0.81 (0.69–0.96) | |
Malmö | 6134 (78) | 0.65 (0.32–1.32) | 1.01 (0.82–1.25) | |
Missing | 40 | Â | Â | |
Birth year | 2005 | 1066 (14) | 1.0 | 1.0 |
2006 | 2395 (30) | 1.94 (1.18–3.19) | 1.22 (1.07–1.39) | |
2007 | 1664 (21) | 1.66 (0.90–3.04) | 1.10 (0.95–1.28) | |
2008 | 2179 (28) | 2.56 (1.34–4.90) | 1.17 (1.01–1.35) | |
2009 | 594 (8) | 2.44 (0.68–8.77) | 1.48 (1.19–1.84) | |
Birth season | Winter (Dec–Feb) | 1957 (25) | 1.0 | 1 |
Spring (March–May) | 1946 (25) | 1.12 (0.76–1.67) | 1.02 (0.91–1.15) | |
Summer (June–Aug) | 1835 (23) | 0.47 (0.30–0.73) | 0.85 (0.75–0.95) | |
Autumn (Sep–Nov) | 2160 (27) | 0.59 (0.40–0.88) | 0.87 (0.78–0.98) | |