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Performance on procedural learning (PL) measures by number of risk factors (marijuana, MJ, dependence and HIV serostatus). 0RF, no risk factors; 1RF, one risk factor; 2RF, two risk factors. Data points are means and standard errors. Statistically significant monotonic trend across number of risk factors were evidence for Rotary Pursuit Task (RPT; p = .014) and Star Mirror Tracing (SMT; p = .001), but not Weather Prediction Task (WPT; p = .91).
