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Background: Although twin deliveries after assisted reproduction treatment (ART) are common, the mental health of the parents has scarcely been addressed. Therefore, we evaluated the psychological well-being of ART and spontaneously conceiving parents of twins and singletons. Furthermore, the impact of parity and children's health-related factors on mental health was evaluated., Methods: We conducted a prospective longitudinal questionnaire study among ART parents of 91 pairs of twins and of 367 singletons and on control parents of 20 pairs of twins and of 379 singletons in the 2nd trimester of pregnancy (T1), and when the children were 2 months (T2) and 1-year old (T3). Symptoms of depression and anxiety, sleeping difficulties and social dysfunction were addressed via a questionnaire. The effects of parity and child-related factors were assessed at T2., Results: At T1, ART mothers of twins showed fewer symptoms of depression than control mothers of twins (P < 0.05). At T2, both ART and control mothers of twins had more symptoms of depression and anxiety than all mothers of singletons (F = 5.20, P < 0.05 and F = 3.93, P < 0.05, respectively). At T3, both ART and control mothers of twins continued to report more symptoms of depression than the mothers of singletons (F = 10.01, P < 0.01), but a difference in anxiety symptoms was seen only in the control group. All fathers had similar mental health at T1. At T2, ART and control fathers of twins reported more symptoms of depression (F = 4.15, P < 0.05) and social dysfunction than fathers of singletons. At T3, both ART and control fathers of twins had more symptoms of depression (F = 4.29, P < 0.05) and anxiety (F = 5.40, P < 0.05) than fathers of singletons. Control fathers of twins had more sleeping difficulties than fathers of singletons (F = 6.66, P < 0.01). Parity did not differently affect parental mental health at T2 in the study groups. Prematurity did not affect maternal mental health, but it had a negative impact on control fathers' social dysfunction (F = 3.34, P < 0.05)., Conclusions: Twin parenthood, but not ART, has a negative impact on the mental health of mothers and fathers during the transition to parenthood. ART parents' mental health was not affected by parity or children's health-related factors.

Obstetric and neonatal outcomes of assisted reproduction and control singletons were evaluated after taking into account treatment characteristics and infertility background. The elective single embryo transfer (eSET) group (n = 45) was compared with the compulsory single embryo transfer (cSET; n = 52), double embryo transfer (DET; n = 227) and control (n = 304) groups. Infertility-related prognostic factors for neonatal outcomes were also analysed. Data were collected with structured questionnaires at gestational week 20 and 8 weeks after delivery. Spontaneous onset of delivery was more typical of the eSET group than of cSET and DET groups (68.9 versus 52.0%, P = 0.02). Mean (±SD) gestation at birth (39.3 ± 1.6 weeks) and mean birth weight (3470 ± 505 g) of eSET singletons were comparable with other assisted reproduction groups, but gestational duration was lower than in the eSET group than in the control group (39.9 ± 1.4; P < 0.05). However, numbers of preterm births and low birth weight infants were similar between groups. History of induced abortion increased risk of preterm birth (OR 4.5 and 95% CI 1.2-17.1) in assisted reproduction singletons. A small though clinically unimportant difference in gestational age at birth and birth weight between assisted reproduction and control singletons was found regardless of the number of embryos transferred. [ABSTRACT FROM AUTHOR]