Table 3 Published studies on repeatability (κ) of a self-reported questionnaire in preschool children and schoolchildren

Authors	Strippoli(this study)	Powell et al10	Luyt et al11	Haby et al24	Brunekreef et al2	Clifford et al5	Salome et al4
n (response rate)	413 (58%)	114 (47%)	100? (?)*	104 (50%)	410 (87%)	200? (<50%)*	111 (83%)
Age	1 year	6–35 months	1–5 years	3–5 years	6–12 years	7–11 years	8–11 years
Interval	3 months	2 weeks	6 months	2 months	1 month	4 months	1 month
Wheeze ever	0.73	0.68	0.88	0.84	0.76		0.80
Wheeze last 12 months	0.69		0.79	0.60	0.78	0.78
Shortness of breath	0.61	0.48			0.71	0.50
Diagnosis of asthma	0.74		0.82	1.00	0.76		0.77
Chronic rhinitis	0.42				0.57
Cough without a cold	0.54	0.58	0.19
Cough at night	0.39	0.56			0.49	0.60	0.51

Level of agreement indicated by κ: ⩽0.4 poor, 0.41–0.60 moderate, 0.61–0.80 good, >0.8 excellent.
*The questionnaire was mailed to this number of patients. No detailed information about the response rate.