Biological exposure assessment to tetrachloroethylene for workers in the dry cleaning industry

Table 3 Demographic characteristics of 18 female dry cleaning workers in the study

Characteristic	Mean ± Standard deviation	Range	Percent
Age (years)	41 ± 12	22 – 68
Body mass index ^a	28 ± 5	21 – 37
Race (white)			72
Employment in industry (years)	8 ± 5	1 – 19

^a BMI calculated as weight(kg)/[height (m)]². Normal BMI for adult women is 19–25 kg/m². BMI > 30 is considered obese [35]