Research Article
Comparison of Naturally Conceived and IVF-DZ Twins in the Netherlands Twin Registry: A Developmental Study
Table 2
Mode of delivery, birth weight and length, incubator, and hospital admission for IVF/ICSI twins and matched NC twins.
| | IVF/ICS twins | Matched NC twins |
*
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| | Delivery (% caesarean-section) | 1085 (36.1%) | 804 (27.2%) | <0.001 | | Birth weight (g) (mean Ā± SD) | | | | | āFirst born | 2494 (557) | 2560 (546) | 0.001 | | āSecond born | 2405 (563) | 2507 (542) | <.001 | | Birth weight (% <1500āgr) | | | | | āFirst born | 69 (4.5%) | 44 (3.0%) | 0.024 | | āSecond born | 90 (5.9%) | 66 (4.5%) | 0.074 | | Birth weight discordance (mean Ā± SD) | 13.01 (10.40) | 12.05 (9.46) | 0.009 | | ā% with ā„20% discordancy | 338 (22.3%) | 276 (18.8%) | 0.016 | | Birth length (mean Ā± SD) | | | | | āFirst born | 46.47 (3.73) | 46.86 (3.58) | 0.015 | | āSecond born | 46.25 (3.83) | 46.76 (3.51) | 0.002 | | Incubator (% yes) | 1566 (51.6%) | 1454 (48.9%) | 0.039 | | Incubator (days) (means Ā± SD) | 11.77 (15.44) | 10.16 (15.36) | 0.044 | | Incubator: more than 1 month (% yes) | 171 (11.8%) | 109 (8%) | 0.014 | | Hospital admission at age 3 (% yes) | 422 (15.2%) | 365 (13.2) | 0.055 |
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Note: * value based on tests comparing IVF and matched NC groups.
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