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Table 2 Baseline clinical characteristics of study patients

From: Assisted hatching of vitrified-warmed blastocysts prior to embryo transfer does not improve pregnancy outcomes

 

Assisted Hatched (n = 1986)

Non-Assisted Hatched (n = 179)

P-valueª

Mean maternal age at retrieval

33.8 ± 3.9

33.1 ± 3.7

0.03

Mean maternal age at transfer

35.3 ± 4.0

34.6 ± 4.0

0.02

Cause of infertility

 Ovulatory disorder

14.2% (283)

17.9% (32)

0.18

 Tubal factor

30.5% (606)

32.3% (58)

0.54

 Endometriosis

7.0% (139)

7.3% (13)

0.89

 Male Factor

34.5% (686)

34.1% (62)

0.97

 Other

30.4% (604)

24.7% (45)

0.16

Endometrial preparation protocol

 Natural Cycle

11.2% (223)

13.7% (25)

0.31

 Hormone Replacement Therapy

88.8% (1764)

86.0% (154)

0.31

Number of embryos transferred per cycle

 1

74.1% (1474)

69.8% (125)

0.24

 2

25.5% (506)

30.2% (54)

0.16

 3

0.3% (6)

0.0% (0)

0.91

 4

0.1% (2)

0.0% (0)

0.61

Previous transfers (Fresh & Vitrified-warmed)

 0

14.4% (287)

13.7% (25)

0.80

 1

34.8% (692)

34.6% (63)

0.97

 2

22.5% (444)

17.2% (37)

0.08

 3

13.5% (269)

13.7% (23)

0.24

  > 4

15.0% (296)

16.8% (31)

0.40

  1. ªP values are for comparisons of continuous (t test) or categorical (chi-square test) variables between the two groups