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Table 1 Study demographics

From: Hormonal, follicular and endometrial dynamics in letrozole-treated versus natural cycles in patients undergoing controlled ovarian stimulation

  Group I (Natural cycle) Group II (letrozole 2.5 mg) Group III (letrozole 5 mg) P value
Total No of patients 47 125 36  
Age (Mean ± SD) 34.8 ± 5.03 33.5 ± 4.02 33.88 ± 3.45 NS
Day 3 FSH (IU/L) 6.01 ± 1.71 6.47 ± 2.16 7.49 ± 3.76 I VsII: 0.233
I VsIII: 0.033
Total No of cycles started 71 179 50  
Completed cycle: No, [%] 63 [88.7] 142 [79.3] 43 [86]  
Total number of cycles cancelled: No, [%] 8 [11.3] 37 [20.7] 7 [14] 0,06
No of monitoring visits (Mean ±SD) 2.08 ± 1.02 2.3 ± 1.12 2.68 ± 1.11 I VsII: 0.232
I VsIII: 0.003
Causes of cycle cancelling     
   Poor responder: No, [%] 5 [62.5] 9 [24.3] 0 [0] NS
   Ovarian cyst: No, [%] 0 [0] 16 [43.2] 2 [28.6] NS
   Patient request: No, [%] 1 [12.5] 8 [21.6] 0 [0] NS
   Elevated FSH: No, [%] 0 [0] 2 [5.4] 3 [42.9] NS
   Others: No, [%] 2 [25] 2 [5.4] 2 [28.6] NS
Indication for IUI     
   Male factor infertility: No, [%] 38/71 [53.5] 55/179 [30.7] 19/50 [38] NS
   Unexplained infertility: No, [%] 33/71 [46.5] 106/179 [59.3] 30/50 [60] NS
   Endometriosis: No, [%] 0 [0] 9/179 [5] 0 [0] NS
   Others No, [%] 1/71 [1.4] 9/179 [5] 1 [2] NS