Figure 4From: Sample size and power estimation for studies with health related quality of life outcomes: a comparison of four methods using the SF-36 Estimated power curves for the SF-36 Energy/Vitality dimension using general population data (females aged 16–45), based on α = 0.05 (two-sided) with 10,000 bootstrap replications SF-36 Energy Dimension (General Population Females aged 16–45); n= 487; mean = 59.3; sd = 21.1; 1% scoring 100.Back to article page