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Table 2 Regression analysis for the monthly number of denied sales per pharmacy

From: Evaluation of pseudoephedrine pharmacy sales before and after mandatory recording requirements in Western Australia: a case study

Variable Chi-square (DF) Rate ratio 95 % CI p-value
Season 12.5 (3)    0.0059
 Summer   0.99 0.93–1.05 0.6748
 Autumn   1.03 0.96–1.10 0.3674
 Winter   1.07 1.02–1.12 0.0047
 Spring   1 (reference)   
Mandatory 6.5 (1) 1.17 1.04–1.31 0.0107
Year 14.9 (1) 1.14 1.09–1.20 <0.0001
Mandatory Yeara 74.3 (1) 0.70 0.64–0.76 <0.0001
 Year (before)b   1.14 1.09–1.20 <0.0001
 Year (after)b   0.80 0.76–0.83 <0.0001
  1. aInteraction term between year and Mandatory (indicating pre- or post- reporting)
  2. bSeparate annual rates pre- and post-mandatory reporting