Sustained never smokers | “Starters” | Sustained ex-smokers | “Resumers” | Sustained smokers | “Quitters” | p Value† (two-sided) | |
Men (n = 4787):* | |||||||
Number of participants | 814 | 16 | 569 | 163 | 2688 | 537 | |
Mean (SD) serum thiocyanate (μmol/litre) | 26.2 (11.5) | 41.4 (15.6) | 25.4 (13.0) | 56.9 (22.0) | 65.6 (22.8) | 27.0 (14.3) | 0.25 |
Women (n = 4654):* | |||||||
Number of participants | 1819 | 34 | 297 | 130 | 2046 | 328 | |
Mean (SD) serum thiocyanate (μmol/litre) | 26.7 (11.6) | 45.0 (19.4) | 29.1 (14.2) | 61.7 (28.4) | 74.5 (25.8) | 33.0 (17.9) | 0.001 |
*Participants not reporting cardiovascular disease, diabetes or treatment for hypertension, or symptoms of angina pectoris or atherosclerosis obliterans; †p values represent differences between the sustained ex-smokers and the sustained never smokers.