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. 2008 Apr 27;336(7655):1223–1227. doi: 10.1136/bmj.39545.852616.BE

Table 5.

 Prolonged and point prevalence confirmed abstinence from smoking at follow-up in patients using nortriptyline plus nicotine replacement therapy or placebo plus nicotine replacement therapy. Values are numbers (percentages) of participants unless stated otherwise

Variable Intention to treat analysis Per protocol analysis
Nortriptyline group (n=445) Placebo group (n=456) Difference % (95% CI) Relative risk (95% CI) Nortriptyline group (n=337) Placebo group (n=325) Difference % (95% CI) Relative risk (95% CI)
Prolonged abstinence:
 4 weeks 220 (49.4) 211 (46.3) 3.2 (−3.4 to 9.7) 1.07 (0.92 to 1.22) 197 (58.5) 186 (56.0) 1.2 (−6.3 to 8.8) 1.04 (0.91 to 1.19)
 6 months 72 (16.2) 55 (12.1) 4.1 (−0.4 to 8.7) 1.34 (0.97 to 1.86) 67 (19.9) 46 (14.2) 5.7 (0.0 to 11.4) 1.40 (1.00 to 1.98)
 12 months 49 (11.0) 40 (8.8) 2.2 (−1.7 to 6.1) 1.26 (0.84 to 1.87) 44 (13.1) 33 (10.2) 2.9 (−2.0 to 7.8) 1.29 (0.84 to 1.97)
Point prevalence abstinence:
 4 weeks 283 (63.6) 270 (59.2) 4.4 (−2.0 to 10.7) 1.07 (0.97 to 1.19) 247 (73.3) 224 (68.9) 4.4 (−2.5 to 11.3) 1.06 (0.96 to 1.17)
 6 months 75 (16.9) 57 (12.5) 4.4 (−0.3 to 9.0) 1.35 (0.98 to 1.85) 69 (20.5) 48 (14.8) 5.7 (−0.1 to 11.5) 1.39 (0.99 to 1.94)
 12 months 59 (13.3) 48 (10.5) 2.7 (−1.5 to 7.0) 1.26 (0.88 to 1.80) 52 (15.4) 40 (12.3) 3.1 (−2.1 to 8.4) 1.25 (0.85 to 1.84)