Table 2: Sample size calculations§.

MeasureInstrumentDefinitionHypothesized mean (SD) control groupHypothesized mean (SD) intervention groupSample size (total)

AnxietyHADSMean differences between baseline and postintervention3.0 5.1 42

§Null hypothesis Ho = mean difference in pre- /post-HADS score in intervention group = mean difference in pre- /post-HADS score in control group; α (two-tailed) = 0.05 and 1− β = 0.8.