Table 3.

Symptom score distributions statistics

Sample and time point		Skewness (SE)	Baseline symptoms, mean (SD)	Effect size, Cohen d (95% CI)
Treatment sample (n=1098)				1.27 (1.21 to 1.34)
	Pretreatment	0.271 (0.071)a	11.73 (4.83)
	Posttreatment	1.359 (0.076)a	5.60 (4.58)
Control sample depression (n=96)				–0.04 (–0.24 to 0.16)
	Pretreatment	0.178 (0.109)	10.91 (4.53)
	Posttreatment	0.228 (0.109)	11.00 (5.04)

^aStatistical significance beyond .05 alpha on a Shapiro-Wilk test for distribution normality; significance is indicative that normal distribution is not supported within the observed sample.