Objective: To compare in singleton multiparous pregnancies the effect of having a new father for an index pregnancy as compared with multiparas with the same male partner and primiparas.
Material And Methods: 21 year data, 2001-2021, Reunion island. We compared 2233 multiparas who had a new partner NewPMP (cases) with 50,364 same partner multiparas samePMP (controls) and 30,741 primiparas. Paired t-test in for parametric, Mann-Whitney U test for non-parametric continuous variables. P-values < 0.05.
Results: As compared with primiparas, New paternity multiparas had similar neonatal outcomes: average birthweights 3044 g and 3017 g (vs 3125 g grams SamePMP, p < 0.0001), rates of low birthweights, very low birthweights (< 1500 g), rate of prematurity < 37 weeks, rate of early prematurity < 33 weeks and also "placental " intrauterine growth retardation, IUGR. Both primiparas and NewPMP had significant worse neonatal outcomes as compared with same partner multiparas for all these same items (all p < 0.05)). NewPMP had a much higher risk of preeclampsia than primiparas and samePMP (respectively, OR 1.74 and 2.9, p < 0.001), fetal deaths and perinatal mortality respectively, OR 1.4 and 1.8, p < 0.001. In 4 logistical models (primiparity, primipaternity, preeclampsia and "placental IUGR") new paternity multiparas had similar results compared with primiparas but very different results when compared with same partner multiparas.
Conclusions: New paternity multiparas share with primiparas a significantly higher risk of perinatal and maternal morbidities than same partner multiparas. Paternity needs to be specified in all obstetrical files, perinatal databases- Health Registries.
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