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Table 1 Comparison between review results for nicotine gum in 1994 and 2000

From: Updating a systematic review – what difference did it make? Case study of nicotine replacement therapy

  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)
  1. *Level of support could not be assessed for all trials.