Table 3

Multivariate results of competitor price trends for 19 medicines before and after RPI introduction

Price Trends Before RPI are NOT Equal to Price Trends After RPI

Price Trends Before RPI are Equal to Price Trends After RPI

A

B

C

D

E

Medicine

Immediate price effect of RPI^§

Quarterly price trends before RPI

Quarterly price trends after RPI

Quarterly price trends before and after RPI

ampicillin 500 mg injection

-1.19**

-0.27**

0.01

atenolol 50 mg tablets

-0.52**

-0.14*

-0.05

metronidazole 250 mg tablets

-0.35**

-0.03**

0.01

carbamazepine 200 mg tablets

-1.04*

-0.22*

-0.02

diclofenac 75 mg injection

-2.33**

-0.34**

-0.07

doxycycline 100 mg capsules

-1.19**

-0.08**

-0.03

benzylpenicillin 1 g injection

0.06*

-0.02**

erythromycin 250 mg tablets

-0.07

-0.01

amoxicillin 250 mg tablets

0.20*

-0.05**

ciprofloxacin 250 mg tablets

-0.73*

-0.01

enalapril 20 mg tablets (Ednyt^®)

-0.18

-0.21**

ferrous sulfate+folic acid+ascorbic acid tablets (Gyno-Tardyferon^®)

1.96*

0.26**

ferrous sulfate+ascorbic acid tablets (Taryferon^®)

1.40

0.29**

nifedipine 20 mg retard tablets (Corinafar Retard^®)

0.93*

-0.06

prednisolone 5 mg tablets

0.38

-0.10*

diclofenac 25 mg tablets (Ortophen^®)

-0.05

-0.01*

metronidazole 500 mg vaginal suppositories

-4.85**

-0.27**

omeprazole 20mg capsules

0.75*

-0.30**

ketotifen tablets

0.18

-0.08**

^§ Difference in competitor price from the quarter before to the quarter after the RPI was introduced

*p ≤ 0.05

**p < 0.0001

Waning et al. International Journal for Equity in Health 2009 8:43   doi:10.1186/1475-9276-8-43