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Table 3 Comparison between eligible participants (n = 154) who participated and who did not participate in the randomized controlled trial (RCT)

From: Recruiting families for an intervention study to prevent second-hand smoke exposure in children

  RCT -YES n = 50 RCT- N0 n = 104 OR (95% CI)a p-value
Age of the child (mean (SD)) 8.2 (2.4) 9.2 (2.5)   p = 0.97
Wheezing ever (n (%)) 17 (34) 33 (32) 1.1 (0.5–2.3) p = 0.78
Wheezing last 12 months (n (%)) 7 (14) 12 (12) p = 0.28
SHS by#:
 Mother (n (%)) 23 (46) 31 (30) Reference  
 Father (n (%)) 12 (24) 36 (35) 2.2 (1.0–5.2) p = 0.06
 Both parents (n (%)) 15 (30) 36 (35) 1.8 (0.8–4.0) p = 0.16
Highest parental education#:
 Low (n (%)) 9 (18) 14 (13) Reference  
 Middle (n (%)) 24 (48) 48 (46) 1.3(0.5–3.4) p = 0.61
 High/Academic (n (%)) 16 (32) 41 (39) 1.7 (0.6–4.6) p = 0.34
  1. a OR = Odds Ratio, 95%CI = 95% Confidence Interval
  2. # Values may not add up due to missing values