Table 3  Complication of letrozole in step-up protocol.
Dosage  AUB  Ovarian cyct
Letrozole 2.5 mg  2.08%  —
Letrozole 5 mg  2.63%  2.63%
Letrozole 7.5 mg  14.61%  3.7%
χ 2 for linear trend: 6.38, P < 0.011.