Table 1

 Differences between responders and non-responders to the risk factor questionnaire

Controls (n = 394)Difference(95% CI)Cases (n = 1018)Difference(95% CI)
Responders(n = 209)Non-responders(n = 185)Responders(n = 712)Non-responders(n = 306)
*Hodges-Lehmann median differences.21
Median age8.59.0–0.3 (–1.0 to 0.4)*6.37.1–0.5 (–0.9 to –0.1)*
Median Townsend deprivation score of ward of residence7.07.6–0.2 (–0.8 to 0.2)*7.67.60.1 (–0.2 to 0.4)*
Boys138 (66%)101 (55%)11.4 (1.8 to 21.1)445 (63%)188 (61%)1.1 (–5.4 to 7.6)