Fig. 1.

Study population. ^aVision software is a computerised clinical management system used by general practices to record patient information. ^bStart date is the latest of either the date of the patient’s registration at the general practice or the date that the general practice began using vision software. R Date date of patient’s registration in the GP, ASD Dx autism spectrum disorder diagnosis, Psych Rx psychotropic drug prescription, NC Dx neuropsychiatric comorbidity diagnosis