Read a gender gap against the schooling and jobs of the people measured

When a study reports that men or women score higher on a developmental measure, check whether education and occupation explain the gap before you conclude anything about sex.

Why it works

Walker (1984), in a critical review of sex differences in moral reasoning, found only a few inconsistent sex differences in childhood and adolescence. He reports that studies suggesting men show higher moral development in adulthood confound sex with differences in education and occupation (mix the two together, so their separate effects cannot be read off), and that a meta-analysis (a statistical pooling of many studies) supported the conclusion that the overall pattern is one of nonsignificant sex differences. Where schooling and work are confounded with sex, a gap between groups cannot be read as a sex difference until those factors are held fixed.

How to do it

  1. Find out whether the study reports the education and occupation of the people compared.
  2. If it does, check whether the gap shrinks or disappears when those are taken into account.
  3. If it does not report them, write the comparison as unexplained, rather than as a finding about sex.
  4. Ask what else differs between the groups: income, time, responsibility, access to training.

Evidence

Walker (1984) reports that some adult studies found men more morally developed than women, but that in those studies sex differences were confounded with differences in education and occupation, and that a meta-analysis found nonsignificant overall sex differences in moral reasoning. The study concerns the comparison groups, not the reading practice; the practice applies that confound to a reader’s own reading of comparisons and has not been tested. (mechanistic)

Walker’s review covers the literature to 1984. It does not settle whether a gap remains in adult samples that match on schooling, and the practice asks for that control without claiming it always removes a gap.

Sources

Common mistake

Treating a gap between groups as a gap in moral development when the groups differ in schooling, income or work. The measure may be picking up differences in opportunity.

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