Significantly greater reporting of irritability of 0.14 points ( 95 % CI 0.02-0 .26 ) , difficulty sleeping of 0.17 points ( 95 % CI 0.02-0 .31 ) and total side-effects of 0.68 points ( 95 % CI 0.06-1 .30 ) was associated with methylphenidate compared with placebo .
