In a multivariate model controlled for covariates , participants in the extended and maintenance treatment arms reported significantly greater abstinence rates at @ weeks compared with participants in the standard treatment arm ( odds ratio -LSB- OR -RSB- , @ -LSB- @ % CI , @-@ @ -RSB- ; P = @ ) , had a longer duration of abstinence until relapse ( = @ -LSB- @ % CI , @-@ @ -RSB- ; P < @ ) , reported smoking fewer cigarettes per day if not abstinent ( mean -LSB- SD -RSB- , @ -LSB- @ -RSB- vs @ -LSB- @ -RSB- cigarettes per day ; = @ -LSB- @ % CI , @-@ @ -RSB- ; P = @ ) , and reported more abstinent days ( mean -LSB- SD -RSB- , @ -LSB- @ -RSB- vs @ -LSB- @ -RSB- days ; OR , @ -LSB- @ % CI , @-@ @ -RSB- ; P = @ ) .