Table 1

Characteristics of the study population

1 year old2 years old3 years old4 years old5 years old
Boy/girls, n (%)
 SPT+44/20 (68/32)44/19 (70/30)43/19 (69/31)41/19 (68/32)33/16 (66/34)
 SPT−62/65 (49/51)**62/63 (50/50)**62/63 (50/50)*60/59 (50/50)*46/50 (48/52)*
Asthma, n (%)
 SPT+NDND5/62 (8.1)12/60 (20.0)14/49 (28.6)
 SPT−NDND13/125 (10.4)11/119 (9.2*)13/96 (13.5*)

  • The values in parentheses are the percentage of boys/girls or the percentage of children with asthma.

  • Details of when asthma first started for individual subjects is outlined in the supplementary methods.

  • *p<0.05, **p<0.001 between SPT-positive and SPT-negative groups.

  • ND, not determined; SPT, skin prick test.