Fig. 1From: Health-related quality of life in young people: the importance of educationFormula for the sample size determination (n). N (population: young people living in Casablanca) = 2129. Zα2 = 1.6452 (if confidence level 90). p (male proportion) = 0.4814. q (female proportion) = 0.5186. d (margin of error) = 0.05 (5%)Back to article page