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Table 1 Sample size calculation based on previous literature

From: A randomized controlled trial comparing lifestyle intervention to letrozole for ovulation in women with polycystic ovary syndrome: a study protocol

Range of reported
ovulation rates
Letrozole ovulation rate Lifestyle ovulation rate Total sample size needed
Lowest 62%a 38%b 130
Highest 86%c 67%d 150
Median 70% 50% 182
  1. aLegro et al. [29]
  2. bPalomba et al. [36]
  3. cZeinalzadeh et al. [37]
  4. dKarimzadeh and Javedani [38]