Lead poisoning among opium users in Iran: an emerging health hazard

Table 3 Duration of use and daily quantity of consumption against the type of substance

Type of substance	Duration of use ^a (years) Mean ± SD	Daily quantity of consumption ^a (g/day) Mean ± SD
Opium (n = 209)	15.25 ± 9.96	0.87 ± 0.54
Refined opium (n = 16)	16.84 ± 10.56	0.87 ± 0.75
Opium + refined opium (n = 24)	14.81 ± 8.27	1.22 ± 1.13
Test results	F = 0.19, p = 0.83	F = 2.28, p = 0.11

Mean (+SD) years of consumption and the quantity consumed in grams per day (g/day) across the user groups raw opium, refined opium and combination users
Degrees of freedom for time consuming and quantity consumed (df_b = 2, df_w = 246)
^a compared using one way ANOVA test

ISSN: 1747-597X