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Table 1 SSRs of babies from different patients with ART and birth types

From: Associated factors of secondary sex ratio of offspring in assisted reproductive technology: a cross-sectional study in Jilin Province, China

  Total births Male babies Female babies SSR(%)
Infertility type
 Primary 2674 1361 1313 50.90
 Secondary 1159 580 579 50.04
Infertility factor
 Male 1532 766 766 50.00
 Female 1462 747 715 51.09
 Both male and female 548 276 272 50.36
 Unknown 291 152 139 52.23
Fertilization method
 IVF 2290 1177 1113 51.40
 ICSI 1276 611 665 47.88
 R-ICSI 267 153 114 57.30
Embryo transfer morphology
 Fresh 834 430 404 51.56
 Thawed 2999 1511 1488 50.38
Birth type
 Singletons 2147 1076 1071 50.12
 Twins 1686 865 821 51.30
Total 3833 1941 1892 50.64