More patients achieved at least a @ % reduction in ADHD symptom severity in the medication groups ( @ mg : @ of @ participants -LSB- @ % -RSB- ; odds ratio -LSB- OR -RSB- = @ ; @ % CI , @-@ @ ; P < @ ; and @ mg : @ of @ participants -LSB- @ % -RSB- ; OR = @ ; @ % CI , @-@ @ ; P = @ ) compared with placebo ( @ of @ participants -LSB- @ % -RSB- ) .