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I want to use age as a covariate for school attainment and I was wondering if I can use a single age (years and months at the time of an assessment) variable or whether I should use the one corresponding to the distal outcome. I ask this because the project is longitudinal, so the order is preserved across time. So I was thinking it may just be simpler to use the age measure that contains the most datapoints irrespective of the distal outcome.
e.g.,
academics measured in Y1, Y2 and Y3 can all be controlled for the same age variable instead of having age at Y1 controlling for academics at Y1 and age at Y2 controlling for academics at Y2 etc. I correlated the age variables and they are in the .985
Desculpa,
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