Table 1.

The number of completed questionnaires and the proportion of reported wheeze at each age in the full cohort (n = 689)

Age (months)	Method of administration	Number	Report of wheeze (%)
3	By phone	570	12.6
6	In person	609	23.5
9	By phone	480	17.9
12	In person	607	20.4
15	By phone	386	14.5
18	By phone	420	12.6
21	By phone	398	11.8
24	In person	561	15.5
30	By phone	395	12.7
36	In person	558	11.1
48	By phone	417	9.8
60	In person	545	12.3
72	By phone	396	8.3
84	In person	406	11.8
108	In person	300	11.0