Compared with placebo , more reduction was observed with G. biloba regarding ADHD-RS-IV parent rating inattention score ( -7.74 1.94 vs. -5.34 1.85 , P < 0.001 ) and total score ( -13.1 3.36 vs. -10.2 3.01 , P = 0.001 ) as well as teacher rating inattention score ( -7.29 1.90 vs. -5.96 1.52 , P = 0.004 ) .