There is scope to address this through collating data from screening / referral forms, although data must be collected consistently, and questions must be harmonised between agencies.
Mae lle i fynd i'r afael â hyn trwy goladu data o ffurflenni sgrinio / atgyfeirio, er bod yn rhaid casglu data'n gyson, a rhaid cysoni cwestiynau rhwng asiantaethau.