Summary. A comparison of the first‐year progress of university students from co‐educational schools with those from single‐sex schools was made by a matched pair procedure. All students who met the A‐level criteria for matching were extracted from those who took the examination of the WJEC in a three‐year entry to Welsh University Colleges, with first‐year results unknown to the selectors. Variables matched or separated were Arts/Science, sex, population of school area, social class, university institution, and aspects of A‐level attainment, namely, number of subjects taken, best subject, average grade and number of attempts. In Arts there was virtual equality, but in Science the co‐educated made slightly the better progress, significantly so by comparison of failures.
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