A higher proportion of 16 to 17 year olds (25%) were reported as having a mental health problem than those aged 10 to 15 years old (16%).
Adroddwyd bod gan gyfran uwch o bobl ifanc 16 i 17 oed (25%) broblem iechyd meddwl na'r rhai rhwng 10 a 15 oed (16%).