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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