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Table 3 Relative Risk ratio’s for smoking abstinence, all comparisons between conditions

From: Electronic cigarettes in standard smoking cessation treatment by tobacco counselors in Flanders: E-cigarette users show similar if not higher quit rates as those using commonly recommended smoking cessation aids

Comparisons FU1 FU2 FU3 Continuous abstinence Prolonged abstinence
E-cigarette vs. NRT 1.05
[0.79–1.40]
0.75
1.23
[0.89–1.69]
0.22
1.71
[1.04–2.81]
0.03*
1.65
[0.72–3.80]
0.24
1.30
[0.65–2.62]
0.46
E-cigarette vs. Medication 0.79
[0.59–1.05]
0.10
0.84
[0.61–1.15]
0.27
1.20
[0.69–2.10]
0.52
0.71
[0.32–1.56]
0.39
0.83
[0.38–1.77]
0.62
E-cigarette vs. E-cigarette + NRT 1.11
[0.75–1.64]
0.60
1.02
[0.70–1.49]
0.91
1.20
[0.69–2.10]
0.52
0.81
[0.35–1.86]
0.62
0.83
[0.38–1.77]
0.62
E-cigarette vs. No aid 0.93
[0.66–1.32]
0.69
1.02
[0.69–1.49]
0.94
1.24
[0.69–2.23]
0.47
0.89
[0.37–2.14]
0.79
1.03
[0.44–2.44]
0.94
NRT vs. Medication 0.75
[0.56–1.00]
0.05
0.68
[0.48–0.96]
0.03*
0.70
[0.37–1.32]
0.27
0.43
[0.18–1.05]
0.06
0.64
[0.89–1.41]
0.26
NRT vs. E-cigarette + NRT 1.06
[0.72–1.56]
0.77
0.83
[0.56–1.24]
0.37
0.70
[0.37–1.32]
0.27
0.49
[0.19–1.24]
0.13
0.64
[0.89–1.41]
0.26
NRT vs. No aid 0.89
[0.63–1.26]
0.51
0.83
[0.55–1.24]
0.36
0.73
[0.38–1.39]
0.33
0.54
[0.20–1.42]
0.21
0.80
[0.33–1.93]
0.61
Medication vs.
E-cigarette + NRT
1.41
[0.96–2.09]
0.08
1.22
[0.82–1.81]
0.32
1.00
[0.51–1.98]
1.00
1.14
[0.47–2.79]
0.77
1.00
[0.43–2.35]
1.00
Medication vs. No aid 1.19
[0.84–1.68]
0.34
1.22
[0.82–1.81]
0.34
1.03
[0.51–2.09]
0.93
1.25
[0.49–3.20]
0.64
1.25
[0.49–3.20]
0.64
No aid vs.
E-cigarette + NRT
1.90
[0.77–1.84]
0.43
1.01
[0.64–1.57]
0.98
0.97
[0.48–1.95]
0.93
0.91
[0.35–2.42]
0.85
0.80
[0.31–2.04]
0.64
E-cigarette vs.
All other conditions
0.98
[0.77–1.24]
0.83
1.05
[0.82–1.36]
0.68
1.39
[0.96–2.02]
0.08
1.03
[0.56–1.90]
0.93
1.02
[0.59–1.79]
0.34
  1. All are RR, 95% CI and p-values. * p < 0.05. + p < 0.005, when standard alpha levels of 0.05 were adjusted familywise using the Bonferroni correction to 0.005. When absent at a FU, participants were included as “failure” (i.e. not achieved smoking abstinence).