My first question too: > In the absence of individual level data on socioeconomic status in the full SMS1947, we used school attended as a proxy measure to adj

My first question too: > In the absence of individual level data on socioeconomic status in the full SMS1947, we used school attended as a proxy measure to adjust for potential confounding by background socioeconomic status. A Scottish cohort study has shown that primary school has moderate correlation with paternal social class.