Table 1.

Selected social and physical characteristics of study subjects in the exposed and reference groups, given as n, mean and standard deviation (SD).

Variable	Exposed			Reference			p-Value
	n	Mean	SD	n	Mean	SD
Age (years)	67	31.2	±6.2	30	27.8	±6.3	<0.02
Height (cm)	65	161.2	±7.5	27	162.5	±7.2	0.43
Weight (kg)	66	59.0	±9.6	26	58.3	±7.2	0.69
Years in current occupation	52	12.2	±6.4	10	14.3	±5.0	0.26
Years of living in the study area	63	16.8	±8.8	30	23.1	±9.2	0.00