To ask the Scottish Executive how many patients diagnosed with autistic spectrum disorder reside in (a) the State Hospital, Carstairs, and (b) mental hospitals in each NHS board area and, of these, how many are aged (i) under 16, (ii) 16 to 18, (iii) 19 to 25, (iv) 26 to 40 and (v) 41 and over. The information requested isnot held centrally.