Males were more likely to have been referred by their parents (11% of all male referrals), compared with 8% of all female referrals.
Roedd gwrywod yn fwy tebygol o fod wedi cael eu hatgyfeirio gan eu rhieni (11% o'r holl atgyfeiriadau gwrywaidd), o’i gymharu â 8% o'r holl atgyfeiriadau gan fenywod.