The overall rate of smoking cessation was similar between participants in the StopAdvisor and control groups for the primary ( @ -LSB- @ % -RSB- vs @ -LSB- @ % -RSB- participants ; relative risk -LSB- RR -RSB- @ , @ % CI @-@ ; p = @ ) and the secondary ( @ -LSB- @ % -RSB- vs @ -LSB- @ % -RSB- participants ; @ , @-@ ; p = @ ) outcomes ; however , the intervention effect differed across socioeconomic status subsamples ( @ , @-@ ; p = @ and @ , @-@ ; p = @ , respectively ) .