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Table 1 Comparison of patient characteristics among the two study groups

From: Impact of preconceptional serum thyroid stimulating hormone values ranging between 2.5 and 4.5 mIU/L on live birth rates following ovulation induction and intrauterine insemination treatment for unexplained infertility

  TSH 0.27–2.5 mIU/L
n = 543
1110 cycles
TSH 2.51–4.5 mIU/L
n = 183
355 cycles
 
Age (years)* 29 (19–40) 29 (19–40) 0.07
Age range
  < 35 476 (87.6%) 160 (87.4%) 0.85
   ≥ 35 67 (12.4%) 23 (12.6%)  
Body mass index (kg/m2)* 24.2 (18.2–34.8) 23.4 (18.1–34.8) 0.08
Body mass index range    
   < 25 316 (58.2%) 119 (65.0%) 0.67
  25–29.9 182 (33.5%) 53 (28.9%)  
  ≥ 30 45 (8.2%) 11 (6.1%)  
Primary infertility 466 (85.8%) 303 (85.5) 0.92
Infertility duration (years)* 4.02 (2–9) 4.44 (2–10) 0.38
Infertility duration range    
   < 3 years 165 (30.5%) 57 (31.1%) 0.78
  3–5 years 212 (39.0%) 79 (43.1%)  
  > 5 years 166 (30.5%) 47 (25.6%)  
History of pelvic surgery 77 (14.1%) 27 (14.7%) 0.84
Smokers, n 104 (19.3%) 36 (19.8%) 0.87
Smoking ranges    
   1–5 cigarettes/day 42 (7.7%) 12 (6.5%) 0.71
  6–10 cigarettes/day 45 (8.2%) 18 (9.8%)  
  > 10 cigarettes/day 17 (3.1%) 6 (3.2%)  
Alcohol use, n 8 (1.4%) 4 (2.1%) 0.547
Basal assessment on day 2    
  FSH level (IU/L)* 6.8 (2.4 -9.9) 6.8 (1.8–10.0) 0.801
  Prolactin, ng/mL * 14.0 (4–30) 14.1 (5–30) 0.100
  LH level (IU/L) * 4.8 (0.8–40.0) 5.1 (1.4–41.0) 0.091
  Antral follicle count, n* 9 (8–23) 9 (8–24) 0.128
Total motile sperm count (millions) * 43 (10–346) 41 (10–330) 0.835
  1. TSH, thyroid stimulating hormone; FSH, follicle stimulating hormone; LH, luteinizing hormone
  2. *Values are median (25th–75th percentile)