The overall rate of smoking cessation was similar between participants in the StopAdvisor and control groups for the primary ( 237 [ 10 % ] vs 220 [ 10 % ] participants ; relative risk [ RR ] 106 , 95 % CI 089-127 ; p = 049 ) and the secondary ( 358 [ 15 % ] vs 332 [ 15 % ] participants ; 106 , 093-122 ; p = 037 ) outcomes ; however , the intervention effect differed across socioeconomic status subsamples ( 144 , 099-209 ; p = 00562 and 137 , 102-184 ; p = 00360 , respectively ) .