The EDITS scores were significantly higher in the on-time than in the on-demand group at 8 weeks of treatment ( 31.7 + / - 6.9 vs 28.6 + / - 5.8 ) and 1 month after withdrawal ( 30.6 + / - 4.7 vs 27.9 + / - 6.5 ) ( P < 0.05 ) .