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

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

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
  1. 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
  2. Degrees of freedom for time consuming and quantity consumed (dfb = 2, dfw = 246)
  3. a compared using one way ANOVA test