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Harm Reduction

OUTCOME MEASURE (EVENT) GROUP Yes expected No expected Total Experimental 7 43.50 993 956.50 2000 Control 80 43.50 920 956.50 2000 Total 87 87.00 1913 1,913.00 4000 Hypothesis testing (Chi-squared test)   χ2= 61.253 p =

Best estimate 95% CI   EEO (odd) 0.007   0.003   0.015   CEO (odd) 0.087   0.040   0.189   EER (rate) 0.004   0.002   0.007   CER (rate) 0.040   0.032   0.050   RRR 0.913   0.811   0.959   ARR 0.037   0.028   0.046   NNT (benefit) 27   22   36                 ODDS Ratio 0.081   0.037   0.176   Risk Ratio 0.088   0.041   0.189                 NNT for 1 year 27   22   36   NNT for 2 year 14   11   18