Effect of different timing of letrozole initiation on pregnancy outcome in polycystic ovary syndrome.

Many studies have pointed to a decreasing trend in pregnancy rates as the age of the mother increases ( 23 ).

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The live birth rate was 10% higher in the D5 group than in the D3 group (RR = 1.126), but this did not reach statistical significance because the study was not strong enough to look at this outcome (power = 37.4%, alpha = 0.05), so we cannot rule out possible differences with small sample sizes.

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