Table 4– Adjusted associations between skin prick tests (SPTs) and radioallergosorbent test (RAST) and the new onset of asthma and nasal allergy during a 20-year follow-up

	New-onset asthma subjects without asthma at ECRHS I	New-onset nasal allergy subjects without nasal allergy at ECRHS I
Subjects n	874	754
SPT cat	5.46 (2.59–11.49)	6.60 (2.94–14.84)
RAST cat	2.52 (1.04–6.08)	2.01 (0.79–5.10)
SPT Dermatophagoides pteronyssinus	2.23 (1.02–4.88)	1.82 (0.85–3.88)
RAST D. pteronyssinus	1.62 (0.70–3.73)	1.37 (0.64–2.95)
SPT Cladosporium herbarum	3.63 (0.86–15.37)	1.34 (0.18–9.88)
RAST C. herbarum	0.93 (0.22–3.90)	1.18 (0.37–3.79)
SPT birch	2.19 (1.08–4.44)	7.24 (3.91–13.39)
RAST birch	1.16 (0.41–3.30)	5.41 (2.72–10.76)
Any positive SPT^#	2.65 (1.40–5.01)	4.00 (2.21–7.25)
Any positive RAST^¶	1.90 (1.01–3.58)	3.43 (1.90–6.19)

Data are presented as hazard ratio (95% CI) adjusted for sex, centre, social status, family history and smoking, unless otherwise stated. ECRHS: European Community Respiratory Health Survey.^#: at least one positive SPT; ^¶: at least one positive RAST.