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Table 4 Overview about constituents in electronic cigarettes with descriptive statistics and best fit distributions

From: Electronic cigarettes: overview of chemical composition and exposure estimation

Agent Positive samples Mean Median Standard deviation Best fitting risk function for concentration of agent in the beveragea
Nicotine (mg/ml) 65% 11 6.8 13 RiskNormal(11.023;13.134;RiskTruncate(0;))
Glycerol (g/100 g) 94% 37 35 23 RiskWeibull(1.8104;44.812;RiskShift(−2.8327);RiskTruncate(0;))
1,2-Propanediol (g/100 g) 94% 57 64 30 RiskTriang(−18.939;91.8;100.45;RiskTruncate(0;))
Ethylene glycol (g/100 g) 91% 10 5 18 RiskLoglogistic(−0.40204;5.15;1.8215;RiskTruncate(0;))
1,3-Propanediol (g/100 g) 13% 0.6 0 1.7 RiskResample(2;[all measurements])
Thujone (mg/L) 4% 6.7 0 34 RiskResample(2;[all measurements])
Ethyl vanillin (mg/L) 26% 30 0 68 RiskResample(2;[all measurements])
  1. aThe best fit distributions were selected based on Kolmogorov-Smirnov statistics. For 1,3-propanediol, thujone and ethyl vanillin, distribution fitting was not possible due to the low incidence. Random resampling is used for these agents from a data table with all measurements where all samples with not detectable concentrations were treated as zero.