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Table 2 Relationship between different sequencing patterns and age of onset of substance use

From: Investigating the sequential patterns of methamphetamine use initiation in Iran

Sequence C (n = 19)a D (n = 24)a E (N = 17)a F (N = 20)b *P-value
Age started (mean ± SD) 16.15 ± 4.34 17.04 ± 4.92 17 ± 3.77 12.05 ± 3.94 <  0.0001
  1. C (sequencing C): tobacco-opium-MA; D (sequencing D), tobacco-opium-heroin-MA; E (sequencing E): tobacco-alcohol-opium-heroin-MA; and F (sequencing F), tobacco-alcohol-cannabis-opium-heroin-MA.
  2. MA methamphetamine
  3. Dissimilar values (superscripts a and b) of each row are significantly different.
  4. *Values were analyzed by one-way analysis of variance (ANOVA); values are mean ± SD