Table 2

Effectiveness of ‘Check-In’ on smoking status (primary outcome) and other health behaviour at 12-month follow-up measured as dichotomised outcomes

Dichotomies outcomesn (%)Effectiveness (‘Check-In’ vs usual care)
‘Check-In’ group (n=549)Usual care group (n=555)OR (95% CI)P value
Primary outcome
 Daily smokers
  Per protocol, n=71094 (31)147 (36)0.80 (0.58 to 1.09)0.16
  ITT; multiple imputation203 (37)205 (37)0.99 (0.76 to 1.30)0.95
Secondary outcomes
 Binge drinking ≥weekly
  Per protocol, n=71855 (18)84 (20)0.87 (0.60 to 1.27)0.48
  ITT; multiple imputation98 (18)116 (21)0.82 (0.59 to 1.14)0.24
 Physical inactivity (<150 min/week)
  Per protocol, n=721132 (43)186 (45)0.92 (0.68 to 1.23)0.56
  ITT; multiple imputation252 (46)260 (47)0.97 (0.74 to 1.27)0.84
 Obese (BMI ≥30 kg/m2)
  Per protocol, n=68468 (23)90 (23)1.01 (0.71 to 1.45)0.95
  ITT; multiple imputation131 (24)122 (22)0.90 (0.67 to 1.21)0.93
  • Values are number (percentages), ORs and p values for the intervention effectiveness. The analyses are performed as per protocol and ITT with multiple imputation.

  • BMI, body mass index; ITT, intention to treat.