Car reservation and pickup: type of car requested by confederate | ||||||
Non-smoker | No preference stated: unknown designation | Smoker | ||||
Local | National | Local | National | Local | National | |
Dust nicotine (μg/g) | ||||||
25th Percentile | 4.9 | 2.4 | 3.4 | 4.8 | 16.8 | 4.4 |
Median; geometric mean* | 8.1; 10.2 | 4.2; 9.2 | 16.7; 15.8 | 14.4; 13.9 | 33.2; 33.7 | 14.3; 16.1 |
75th Percentile | 28.6 | 23.1 | 66.7 | 35.5 | 52.1 | 57.9 |
Max | 46.0 | 55.6 | 81.64 | 85.3 | 936.5 | 384.7 |
% More than threshold (6.18 μg/g)§ | 75 | 45 | 60 | 67 | 93 | 60 |
Surface nicotine (μg/m2) | ||||||
25th Percentile | 0 | 0 | 0.1 | 0 | 0.3 | 0.1 |
Median; geometric mean‡ | 0.2; 0.7 | 0.2; 0.5 | 0.4; 1.0 | 0.2; 0.7 | 0.9; 1.9 | 1.5; 1.7 |
75th Percentile | 1.2 | 0.9 | 1.3 | 1.0 | 2.9 | 3.1 |
Max | 17.7 | 5.9 | 68.8 | 42.5 | 506.8 | 70.8 |
% More than threshold (0.14 μg/m2)§ | 52 | 54 | 66 | 57 | 88 | 72 |
Air nicotine (ng/m3) | ||||||
25th Percentile | 8.2 | 6.8 | 7.2 | 11.6 | 17.7 | 4.0 |
Median; geometric mean† | 24.0; 21.4 | 17.8; 24.9 | 17.7; 17.5 | 30.2; 27.2 | 50.4; 47.2 | 25.0; 25.4 |
75th Percentile | 62.6 | 70.1 | 45.3 | 65.1 | 85.6 | 89.6 |
Max | 292.6 | 341.5 | 224.3 | 593.5 | 814.5 | 889.3 |
% More than threshold (20 ng/m3)§ | 57 | 44 | 46 | 63 | 71 | 66 |
Air 3-EP (ng/m3) | ||||||
25th Percentile | 2.3 | 2.7 | 2.2 | 3.3 | 3.1 | 2.3 |
Median; geometric mean† | 9.3; 9.9 | 6.7; 8.7 | 8.4; 7.8 | 12.1; 10.6 | 26.9; 22.6 | 12.4; 11.5 |
75th Percentile | 44.9 | 22.5 | 18.4 | 26.6 | 86.7 | 33.5 |
Max | 270.8 | 202.3 | 222.5 | 179.9 | 292.4 | 564.6 |
↵* Pairwise comparison for dust nicotine levels: p<0.05 (Tukey HSD) non-smoker versus smoker.
↵† Pairwise comparisons for air nicotine and air 3-EP: are not statistically significant, p>0.05 (Tukey HSD).
↵‡ Pairwise comparisons for surface nicotine: p<0.05 (Tukey HSD): non-smoker versus unknown; unknown versus smoker car.
↵§ Thresholds based on used cars for sale by non-smokers with a car smoking ban.7