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Table 2 Effects of the two different types of cigarette

From: Short-term effects of a nicotine-free e-cigarette compared to a traditional cigarette in smokers and non-smokers

  Overall population Smokers vs. non smokers
  Effect 95 % CI P Effect 95 % CI P
FeCO (ppm)       
Traditional 4.3 (2.3 to 6.2) <0.001 2.9 (−0.9 to 6.7) 0.127
Electronic −0.2 (−0.8 to 0.4) 0.486 −0.6 (−1.8 to 0.6) 0.301
P value <0.001 0.067
FeNO (ppb)       
Traditional −0.6 (−1.6 to 0.4) 0.219 1.4 (−0.6 to 3.4) 0.155
Electronic −0.2 (−0.8 to 0.4) 0.512 0.8 (−0.5 to 2.1) 0.198
P value 0.372 0.501
FEV1 (%)       
Traditional −3.4 (−5.9 to −0.8) 0.013 −1.0 (−6.1 to 4.1) 0.691
Electronic −1.7 (−4.8 to 2.9) 0.070 −2.1 (−5.7 to 1.6) 0.250
P value 0.098 0.575
FVC (%)       
Traditional −1.6 (−5.7 to 2.6) 0.437 −3.9 (−12.2 to 4.4) 0.331
Electronic −1.0 (−4.8 to 2.9) 0.602 −2.2 (−9.8 to 5.4) 0.543
P value 0.584 0.448
FEV1/FVC       
Traditional −1.9 (−3.9 to 0.1) 0.065 2.0 (−2.0 to 6.1) 0.304
Electronic −0.9 (−2.5 to 0.6) 0.226 −0.1 (−9.8 to 3.0) 0.926
P value 0.182 0.132
PEF (%)       
Traditional −6.5 (−11.7 to −1.3) 0.017 −7.5 (−17.8 to 2.9) 0.148
Electronic −3.8 (−9.2 to 1.6) 0.155 −6.0 (−16.8 to 4.8) 0.254
P value 0.145 0.692
FEF25 (%)       
Traditional −5.8 (−10.9 to −0.6) 0.030 .4.1 (−14.1 to 6.2) 0.412
Electronic −3.7 (−7.6 to 0.3) 0.066 −7.1 (−15.0 to 0.7) 0.073
P value 0.252 0.414
FEF50 (%)       
Traditional −5.0 (−9.5 to −0.4) 0.033 2.1 (−6.9 to 11.1) 0.629
Electronic −2.9 (−6.8 to 1.1) 0.143 −2.9 (−10.8 to 5.0) 0.447
P value 0.161 0.096
FEF75 (%)       
Traditional −6.1 (−11.9 to −0.3) 0.040 9.3 (−2.3 to 20.9) 0.107
Electronic −4.8 (−11.2 to 1.6) 0.132 3.6 (−16.4 to 9.3) 0.562
P value 0.657 0.037