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Table 1 Comparisons tested in this study. For all tests, the dependent variable was medication price

From: Country and regional variations in purchase prices for essential cancer medications

Category of Analysis

Independent Variable

Test Performed

Number of Groups

Geographic

Buyers

Kruskal Wallis H

19

Geographic

Region*

Mann-Whitney U

2

Geographic

GDP (nominal)†

Linear Regression

N/A

Geographic

All-Cancer Incidence (per 100,000)‡

Linear Regression

N/A

Medication

Essential Cancer Medications

Kruskal Wallis H

43

Medication

Essential Medication Categories

Kruskal Wallis H

3

Medication

Medication Formulations

Mann-Whitney U

2

Medication

Pre/Post Generic Approval Date§

Mann-Whitney U

2

Longitudinal

Year

Kruskal Wallis H

5

  1. *Obtained from the United Nations [20]
  2. †Obtained from the International Monetary Fund [21]
  3. ‡Obtained from the International Agency for Research on Cancer [22]
  4. §Obtained from DrugBank [26]