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Table 3 Relationship between the age of onset of substance use and monthly income

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

Monthly income

Low-income

Middle-income

High-income

Chi-square

Df

*P-value

Early onset

76

44

19

10.146

2

0.006

Late onset

67

81

15

  1. * The chi-square test was used for the statistical differences