Common functions in this twin pairs included maternal years (years), parity during the beginning, gestational ages (weeks), preterm (digital, 17 number of prenatal meetings, variety of birth (caesarean otherwise regular), marital status, battle and you will education. Personal qualities was basically sex (the main coverage) HJERNE, birthweight (carried on, for each 100 g), lower birthweight (digital, less than 2500 g, according to Who recommendations) 18 and birth acquisition (binary).

Outcomes

Beginning outcomes had been congenital defects understood within birth and you can Apgar ratings within very first and you may 5th moments (Apgar1 and you can Apgar5) obtained in one in order to 10 and also referred to as lower in the event that 19 infant mortality is recognized as passing in the first year and you will is stratified with the very early neonatal fatalities (death in the first seven over months), later neonatal deaths (demise inside 8 and you may twenty eight over days) and you will postneonatal deaths (demise inside Months 31 so you can 365). There were certain missing analysis: 1% to own birth acquisition, 1.2% to possess Apgar1, step 1.2% for Apgar5 and you can step one.4% to possess congenital defects. Twins sets that have destroyed study for only you to definitely dual were provided about analyses.

Statistical studies

Very first, we computed descriptive statistics to own maternal qualities of your own twin sets ( Dining table step one) and you will checked out to possess differences between men and women having fun with matched up t screening into the carried on variables: birthweight (per 100 grams), Apgar1 and you can Apgar5 ( Dining table 2). 자세히 보기