Table 2 Crude prevalence of birth defects and RR with 95 % CI according to the method of treatment by birth year period
Fresh embryo transfer | FET | RR (95 % CI) Fresh vs. FET | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
IVF | ICSI | RR (95 % CI) ICSI vs. IVF | Total | |||||||
Births | Prevalence (%) | Births | Prevalence (%) | Births | Prevalence (%) | Births | Prevalence (%) | |||
2004–2006 | 19,785 | 139 (0.70) | 17,309 | 153 (0.88) | 1.26 (1.00–1.58) | 37,094 | 292 (0.79) | 20,068 | 114 (0.57) | 1.39 (1.12–1.72) |
2007–2009 | 14,957 | 184 (1.23) | 15,095 | 223 (1.48) | 1.20 (0.99–1.46) | 30,052 | 407 (1.35) | 38,342 | 503 (1.31) | 1.03 (0.91–1.18) |
2010–2012 | 14,028 | 211 (1.50) | 16,267 | 234 (1.44) | 0.96 (0.80–1.15) | 30,295 | 445 (1.47) | 69,487 | 964 (1.39) | 1.06 (0.95–1.18) |
Total | 48,770 | 534 (1.09) | 48,671 | 610 (1.25) | 1.15 (1.02–1.29) | 97,441 | 1144 (1.17) | 127,897 | 1581 (1.24) | 0.95 (0.88–1.02) |