Table 1 Comparison between review results for nicotine gum in 1994 and 2000
Review year | 1994 | 2000 | |
|---|---|---|---|
a) All trials | No. of trials | 38 | 48 |
Odds ratio | 1.64 | 1.63 | |
95% CI | 1.48–1.81 | 1.49–1.79 | |
Χ2 & p for heterogeneity | 43.94 (p = 0.2) | 55.22 (p = 0.19) | |
b) Level of support sub group*: | No. of trials | 17 | 19 |
-Low intensity | Odds ratio | 1.81 | 1.72 |
95% CI | 1.54–2.12 | 1.48–2.00 | |
Χ2 & p for heterogeneity | 22.76 (p = 0.12) | 25.71 (p = 0.11) | |
-High intensity | No. of trials | 18 | 25 |
Odds ratio | 1.55 | 1.56 | |
95% CI | 1.33–1.80 | 1.37–1.78 | |
Χ2 & p for heterogeneity | 17.44 (p = 0.42) | 22.61 (p = 0.54) |