Researchers investigated the effect of broadband ultraviolet B (UVB) therapy and topical calcipotriol cream used together on areas of psoriasis. One of the outcome variables is the Psoriasis Area and Severity Index (PASI). The PASI scores for 20 subjects are measured at baseline and after eight treatments. These scores are continuous, which statistical test would you suggest to use to indicate whether the combination therapy reduces PASI scores?

		ANOVA
		Dependent t-test
		Two-sample t-test
		One sample t-test