Table 2

Serum cysteine concentration (nmol/ml) quantiles in the sub-cohort from the Linxian General Population Nutrition Intervention Trial cohort, overall and by sex, age, smoking, and drinking status

	Quantile
	25^th	50^th	75^th
General Population Trial Cohort^*
Overall	178	196	216
Sex
Men	179	196	215
Women	176	196	217
Age (in years)
<50	168	188	204
50–60	186	203	225
>60	193	212	231
Cigarette smoking^†
Never smokers	181	194	219
Ever smokers^†	179	196	212
Alcohol drinking^‡
Non-drinkers	174	195	216
Drinkers^‡	183	200	213

↵* All concentrations are weighted by the age and sex sampling to reflect the distributions in the full cohort.
↵† Daily cigarette consumption among men was generally low and few subjects had quit smoking, so smoking is presented as never smoking versus ever smoking.
↵‡ Alcohol consumption was minimal at the time of the baseline interview (1985), so alcohol drinking was categorised as any consumption in the previous 12 months versus none.