Descriptive statistics

Rationale: There are two possibilities in which the two groups to be compared are not independent: One group in which each individual is measured twice (pre- & post- treatment: each individual is his/her own control); or two groups in which each individual from one group is matched to one individual in the second group (one-to-one matched groups. When data are not normally distributed and the sample size is not large (n < 30), we use Sign Test and Wilcoxon Signed Ranks Test. In this case the difference variable measure2 or post-intervention) is the difference between pre-and post-intervention measures.

signrank measure1 = measure2)