Compared with controls , intervention patients reached 7 SABA canister dispensings less frequently ( 50.7 % vs 57.1 % ; risk ratio 0.89 [ 95 % CI , 0.82-0 .97 ] ; P = .007 ) and later ( hazard ratio 0.80 [ 95 % CI , 0.71-0 .91 ; P < .001 ) .