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Table 2 Point Biserial Correlations Between Age and Type of Opioid use

From: Age differences in heroin and prescription opioid abuse among enrolees into opioid treatment programs

  Within-OTP Between-OTP
Age with Heroin Only .07* .69*
Age with PO Only -.01 -.61*
Age with Both Heroin & PO -.06* .28*
  1. Significance was determined using z-tests in which the covariance parameter estimate was divided by its standard error and compared with a critical value from the normal distribution (2.58, corresponding to p < .01). Covariances were converted to correlations for presentation here. Sample sizes for this analysis were 29114 individual enrolees nested within one of 85 OTPs.
  2. * p < .01