Table 2

 Effect of NRT on long-term smoking cessation

StudyNRTPlaceboWeight (%)OR (95% CI)
Random effects test of overall effect: Z = 4.79, p<0.001.
*Number of participants who successfully maintained smoking cessation/number entering trial.
†Figures in brackets give number successful at earlier 12 month follow up.
CI, confidence interval; OR, odds ratio.
Blondal 198929/92* (30)†21/90 (22)9.91.51 (0.78 to 2.92)
Blondal 199715/79 (20)11/78 (13)7.31.43 (0.61 to 3.34)
Blondal 199919/118 (32)10/119 (13)7.72.09 (0.93 to 4.72)
Clavel 199730/481 (53)32/515 (43)12.51.00 (0.60 to 1.68)
Daughton 199939/193 (50)15/202 (19)10.33.16 (1.68 to 5.94)
Glavas 200310/56 (13)8/56 (9)5.71.30 (0.47 to 3.60)
Herrera 199530/76 (37)13/78 (17)8.53.26 (1.54 to 6.92)
Mikkelsen 199415/145 (24)4/144 (6)4.84.04 (1.31 to 12.5)
Richmond 199721/153 (29)8/152 (14)7.32.86 (1.23 to 6.69)
Stapleton 199819/116 (33)7/111 (14)6.72.91 (1.17 to 7.23)
Tonnesen 198817/60 (23)5/53 (12)5.23.80 (1.29 to 11.2)
Yudkin 200348/815 (91)35/810 (62)14.01.39 (0.89 to 2.17)
Total292/2384 (435)169/2408 (244)1001.99 (1.50 to 2.64)