"The relative risks of mortality for adoptive parents are always lower than those of parents with biological children." https://link.springer.com/article/10.1007%2Fs10680-018-9469-1 …pic.twitter.com/b9MBRvdWsy
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The excerpt says the effect remained after they controlled for socioeconomic covariates.
Thanks! Then, maybe the key may be found among the socioeconomic variables choosen and those ommited. Quite interesting, in any case.
The authors suspect, but can't prove, it has to do with self-selection of individuals who go for adoption - and the selection criteria imposed on them.
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