Table 1 Prevalence of respiratory symptoms, in respondents and non-respondents to the repeatability study
Non-respondents (n = 340)Respondents (n = 413)p
Baseline surveyBaseline surveyRepeat survey
n (%)(95% CI)n (%)(95% CI)n (%)(95% CI)
Wheeze
    Wheeze ever138 (40.6)(35.3–45.8)116 (28.1)(23.7–32.4)120 (29.1)(24.7–33.5)<0.001
    Wheeze last 12 months121 (35.6)(30.5–40.7)110 (26.6)(22.3–30.9)105 (25.4)(21.2–29.6)0.008
    Wheeze without colds42 (12.4)(8.8–15.9)34 (8.2)(5.6–10.9)35 (8.5)(5.8–11.2)0.062
    Shortness of breath73 (21.5)(17.1–25.9)57 (13.8)(10.5–17.1)60 (14.5)(11.1–18.0)0.006
Cough
    Cough without colds150 (44.1)(38.8–49.4)130 (31.5)(27.0–36.0)138 (33.4)(28.8–38.0)<0.001
    Cough at night83 (24.4)(19.8–29.0)86 (20.8)(16.9–24.8)81 (19.6)(15.8–23.5)0.240
Diagnoses
    Diagnosis of asthma43 (12.6)(9.1–16.2)39 (9.4)(6.6–12.3)42 (10.2)(7.2–13.1)0.160
    Eczema last 12 months122 (35.9)(30.8–41.0)148 (35.8)(31.2–40.5)153 (37.1)(32.4–41.7)0.989
Ears, nose and throat symptoms
    Chronic rhinitis103 (30.3)(25.4–35.2)124 (30.0)(25.6–34.5)105 (25.4)(21.2–29.6)0.936
    Snoring179 (52.6)(47.3–58.0)230 (55.7)(50.9–60.5)215 (52.1)(47.2–56.9)0.404
    Repeated otitis media146 (42.9)(37.7–48.2)157 (38.0)(33.3–42.7)160 (38.7)(34.0–43.5)0.170
  • p, significance of difference in baseline symptom prevalence between respondents to the repeat survey and non-respondents; for the respondents there were no significant differences in symptom prevalence between the baseline and repeat surveys.