Table 1.

Total IgE levels and the prevalence (% and 95% CI) of allergen-specific IgE in schoolchildren in Finland and Russian Karelia

	Finland (n = 266)	Russian Karelia (n = 266)	P-value
Total IgE
Median IU/l (range)	39 (0–3328)	77 (2–3522)	< 0·001
> 100 IU/l (%)	26 (21–32)	40 (34–46)	0·001
Cat (%)	11 (8–16)	2 (1–5)	< 0·001
Birch (%)	11 (8–16)	2 (1–5)	< 0·001
Egg albumen (%)	6 (4–10)	3 (2–6)	0·093
At least one positive (%)	22 (17–27)	6 (4–10)	< 0·001