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Table 1 Patient demographics and characteristics

From: Single blastocyst transfer yields similar pregnancy rates compared with multiple cleavage embryo transfer, with reduced twin rate, in patients with low number of fertilized oocytes

CharacteristicsSingle blastocystSingle cleavage2+ cleavage
(n = 1138)(n = 1925)P valuea(n = 3732)P valuea
Patient’s age, mean (SD)33 (3.4)33.6 (3.2)< 0.000133.7 (3.3)< 0.0001
Race/ethnicity, n (%)  0.08 0.03
 Non-Hispanic White52 (4.6%)138 (7.2%) 234 (6.3%) 
 Non-Hispanic Black74 (6.5%)126 (6.5%) 196 (5.3%) 
 Other (Asian/American Indian)456 (40.1%)742 (38.5%) 1586 (42.5%) 
 Hispanic/Latino118 (10.4%)200 (10.4%) 333 (8.9%) 
 Unknown438 (38.5%)719 (37.4%) 1383 (37.1%) 
Recipient’s BMI, mean (SD)26 (5.9)26.1 (6.1)0.7526.4 (6.1)0.09
Parity, n (%)  0.09 0.69
 Multiparous197 (17.4%)383 (20.0%) 668 (18.0%) 
 Nulliparous935 (82.6%)1532 (80.0%) 3046 (82.0%) 
Gravidity, median [Q1, Q3]0 [0, 1]0 [0, 1]0.310 [0, 1]0.80
Smoker45 (4.0%)81 (4.2%)0.80155 (4.2%)0.83
Infertility diagnoses, n (%)     
 Male infertility405 (35.6%)673 (35.0%)0.751,371 (36.7%)0.50
 Endometriosis140 (12.3%)198 (10.3%)0.10400 (10.7%)0.15
 Polycystic ovarian syndrome135 (11.9%)208 (10.8%)0.40426 (11.4%)0.72
 Diminished ovarian reserve279 (24.5%)602 (31.3%)< 0.00011057 (28.3%)0.01
 Tubal ligation/hydrosalpinx/other176 (15.5%)297 (15.4%)1.00584 (15.6%)0.92
 Uterine factor infertility62 (5.4%)86 (4.5%)0.26150 (4.0%)0.05
 Unexplained infertility174 (15.3%)286 (14.9%)0.79618 (16.6%)0.33
 Other infertility diagnosis122 (10.7%)174 (9.0%)0.14248 (6.6%)< 0.0001
FSH dose IU, mean (SD)3601.9 (1776.8)3622.6 (1876.3)0.773592.6 (1728.9)0.88
No. of available oocytes, median [Q1, Q3]6 [4, 9]4 [2, 7]< 0.00016 [4, 8]0.84
No. of excess embryos cryopreserved, median [Q1, Q3]0 [0, 1]0 [0, 0]< 0.00010 [0, 0]< 0.0001
Number of fertilized oocytes, median [Q1, Q3]2 [1, 3]1 [1, 2]< 0.00013 [2, 3]< 0.0001
  1. SD standard deviation, Q1 25th percentile, Q3 75th percentile
  2. aCompared to single blastocyst