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Table 1 Patients’ characteristics, grouped based on the operator performing the oocyte retrieval

From: Assessment of operator performance during oocyte retrievals: residents’ learning curve and continuous monitoring of senior physicians

  Operator P value
Resident Mixeda Senior physician
n 315 139 220  
Age (years) 33.5 +/− 4.64 32.5 +/−  4.8 34.1 +/−  4.4 0.005
Body Mass Index (kg/m2) 23.9 +/− 5.45 24.2+/− 5.3 24.1+/−  5.3 0.90
Smoking status     0.58
 Non-smoker 187 (66.8) 77 (66.4) 130 (67.4)  
 Smoker 59 (21.1) 26 (22.4) 48 (24.9)  
 Former smoker 34 (12.1) 13 (11.2) 15 (7.8)  
Baseline E2 (pg/mL) 44.4 +/−  93.3 37.5 +/−  24.3 40.1 +/−  35.0 0.43
Baseline FSH (UI/L) 7.4 +/−  3.5 6.8 +/−  3.1 7.6 +/− 4.1 0.08
Baseline LH (UI/L) 6.4 +/−  17.9 5.3 +/−  3.5 5.4 +/−  3.2 0.62
Baseline AMH (ng/mL) 2.78 +/− 3.07 3.4 +/− 4.4 2.9 +/−  3.5 0.34
Antral Follicle Count 18.6 +/−  11.1 21.3 +/−  12.2 17.9 +/− 11.3 0.04
Etiology of infertilityb
 Endometriosis 44 (14.0) 24 (17.3) 27 (12.3) 0.41
 Tubal factor 11 (4.1) 3 (2.6) 8 (4.1) 0.76
 Oligoasthenoteratospermia 183 (58.1) 73 (52.5) 90 (41.3) 0.001
 Unexplained 66 (20.9) 34 (46.8) 70 (31.8) 0.09
Ovulation disorders     0.46
 • Ovarian insufficiency 40 (12.7) 12 (8.6) 34 (15.4)  
 • PCOSc 45 (14.3) 21 (15.1) 30 (13.6)  
  1. Data are expressed as n (percentage) or mean +/− standard deviation
  2. aRetrieval performed during the learning period: one side is aspirated by the resident and the other side by the senior physician
  3. bSome couples had several causes of infertility
  4. cPolycystic Ovary Syndrome
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