Fall rates did not change in control facilities ( falls/bed per year : baseline , 2.61 ; after intervention , 2.64 ) but decreased by 12 % in intervention facilities ( falls/bed per year : baseline , 2.34 ; after intervention , 2.06 ) ; the effect of treatment on rate of change was 0.81 ( 95 % confidence interval = 0.55-1 .20 ) .