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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