Table 5

Comparison of the results obtained in four studies using the same simulation approach in computing the statistical power for a parallel group design with follow up duration of 6 months and for expected treatment effects of 60% and 70%. The response variable studied was the number of new enhancing lesions

Sample size		Truyen et al⁷ (n=12)	Nauta et al⁶ (n=23)	Tubridy et al⁸ (n=31)	Present study (n=65)
2×10	60	-	-	-	35
	70	84	71	61	57
2×20	60	80	70	63	50
	70	93	88	81	74
2×30	60	89	78	72	62
	70	99	95	89	85
2×40	60	94	87	83	74
	70	99	100	95	92