Table 1 Referrals received by specialist smoking cessation service after the intervention
Intervention practices (n  27), mean (SD)Usual care practices (n  28), mean (SD)Adjusted incidence rate ratio (95 CI)p Value
Month 15.2 (7.2)0.7 (2.8)7.9 (2.5 to 24.9)
Month 23.0 (3.6)1.3 (5.5)3.1 (1.02 to 9.4)0.002*
Month 32.6 (5.5)0.9 (3.1)6.4 (1.1 to 9.3)
Total referrals over 3-month follow-up10.7 (15.5)2.9 (11.3)4.9 (1.66 to 14.7)0.004

  • Incidence rate ratio was adjusted for clustering by practice and baseline rate.

  • *p Value for time/group interaction.