Controlling for smoking status and gestational age is pretty dubious.
But things are different in Spain. At least, if one trusts results from a big model vs. simple results. http://www.sciencedirect.com/science/article/pii/S0301211507000255 …pic.twitter.com/YADGpxiyXP
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I understand controlling for smoking status. But gestational age is a stupid variable to control for.
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Both are problematic as they are likely effects of group differences. Controlling for them controls for the cause.
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I agree. But I can imagine why someone would think controlling for smoking is justifiable. Gestational age? I can't see any reason.
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They think environmental effects (e.g. stress, pollution) cause preterm births, presumably.
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Yes. Of course genes can cause enviro effects, so controlling for smoking is wrong. But you can't make that argument for gestational age.
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You can. They think outside factors cause lower gestational age in LIMs, which cause earlier term birth, so we have to control for these.
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But, to me, it is not at all obvious that gestational age is "environment" the way smoking is. It's much more of a stretch. (1/2)
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