> It’s unlikely that age alone is driving these results. In sibships of two, older siblings on average were only about one year older than younger siblings. Tha

> It’s unlikely that age alone is driving these results. In sibships of two, older siblings on average were only about one year older than younger siblings. That can’t explain why one group reads this blog so much more often than the other So, uh... People understand that "average difference" is a miserable plan here right?