RESULTS	In the intent-to-treat analysis , mean ( SD ) weight loss of participants in the commercial group was greater than in the self-help group at 1 year ( -4.3 [ 6.1 ] kg vs -1.3 [ 6.1 ] kg , respectively ; P < .001 ) and at 2 years ( -2.9 [ 6.5 ] kg vs -0.2 [ 6.5 ] kg , respectively ; P < .001 ) .\