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
	25th	50th	75th
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 categorized as any consumption in the previous twelve months versus none