Table 3.

Estimated power to detect multivitamin effects on weight change over 18 months of follow-up (n=400)

Mean difference in weight change (δ, in kg)	Standard deviation of weight at baseline and follow-up (σ1= σ2, in cells/mm3)		Correlation of weight between baseline and follow-up (ρ)
		0.5	0.6	0.7
2	9	56	66	78
	11	41	49	61
2.5	9	75	88	96
	11	58	74	86
3	9	88	94	98
	11	74	82	92
3.5	9	96	98	>99
	11	86	92	97