Table 1

Crude associations between risk factors at baseline and the incidence of asthma and rhinitis*
Risk factor at baseline Total number in category n (%) Number with asthma n Asthma OR (95% CI) P-value Number with rhinitis n Rhinitis OR (95% CI) P-value
Eczema <0.001 <0.001
No 2,573 (82.4) 101 1.0 107 1.0
Yes 551 (17.6) 49 2.85 (1.72-4.71) 65 3.14 (2.27-4.36)
Persistence of eczema <0.001
No 2,886 (92.4) 58 1.0 <0.001 135 1.0
Yes 238 (7.6) 15 4.20 (2.31-7.64) 37 3.92 (2.64-5.82)
Onset of eczema <0.001
No 2,483 (80.6) 46 1.0 <0.001 98 1.0
Age ≥ one year 216 (6.9) 6 1.87 (0.7-4.45) 8 0.96 (0.46-2.00)
Age < one year 386 (12.6) 21 3.63 (2.12-6.22) 66 5.02 (3.58-7.05)
Eczema severity <0.001
No 2,478 (79.47) 45 1.0 <0.001 98 1.0
Mild 468 (15.0) 17 2.42 (1.36-4.29) 47 2.74 (1.90-3.95)
Moderate to severe 173 (5.5) 11 4.55 (2.27-9.12) 27 4.74 (2.98-7.55)
Gender 0.001
Female 1,546 (49.5) 25 1.0 0.002 65 1.0
Male 1,579 (50.5) 48 2.16 (1.32-3.54) 107 1.67 (1.21-2.29)
Age of the child 0.727
12-23 month 1,557 (49.8) 41 1.0 0.325 88 1.0
24-35 month 1,568 (50.2) 32 0.79 (0.49-1.27) 84 0.95 (0.70-1.29)
Parental history of allergic disease <0.001
No parent 1,594 (51.0) 26 1.0 <0.001 47 1.0
One parent 1,199 (38.4) 32 1.92 (1.14-3.25) 83 2.45 (1.69-3.53)
Two parents 332 (10.6) 15 (7.2) 3.67 (1.90-7.08) 42 4.85 (3.12-7.55)
Asthma in the child <0.001
No 2,843 (91.4) -- -- 147 1.0
Yes 269 (8.6) -- -- -- 25 4.10 (2.57-6.54)
Length of breastfeeding 0.791
Longer than 6 month 2,043 (65.9) 44 1.0 0.021 112 1.0
Up to 6 months 974 (31.4) 23 1.14 (0.68-1.90) 54 1.02 (0.73-1.43)
No breastfeeding 82 (2.7) 6 3.32 (1.36-8.11) 6 1.35 (0.57-3.16)
Number of bedrooms with PVC 0.116
No PVC in bedroom 1,300 (42.8) 23 1.0 0.184 60 1.0
PVC in one bedroom 558 (18.4) 14 1.42 (0.72-2.79) 38 1.51 (0.99-2.30)
PVC in two bedrooms 1,183 (38.9) 34 1.65 (0.96-2.82) 70 1.31 (0.92-1.87)
Type of building 0.453
Single-family house 2,522 (82.4) 58 1.0 0.902 137 1.0
Multi-family house 538 (17.6) 12 1.04 (0.55-1.96) 33 1.13 (0.75-1.70)
Parental smoking 0.357
No 2,431 (77.8) 56 1.0 0.691 139 1.0
Yes 694 (22.2) 17 1.12 (0.64-1.94) 33 0.83 (0.56-1.23)
Number of adults living with the child 0.830
Two or more adults 2,853 (93.8) 66 1.0 0.320 157 1.0
One adult 190 (6.2) 6 1.54 (0.65-3.62) 11 1.07 (0.57-2.01)

3,124 children aged 1–2 in 2000 in Värmland, Sweden, were included in the analysis.

*during the 5-year follow-up period.

von Kobyletzki et al.

von Kobyletzki et al. BMC Dermatology 2012 12:11   doi:10.1186/1471-5945-12-11

Open Data