At 12 months , IVR call completion was significantly correlated with weight loss ( r = -.22 ; P = .04 ) and participants with an IVR completion rate 80 % had significantly greater weight loss compared to those with an IVR completion rate < 80 % ( -1.97 kg , SE 0.67 vs 0.48 kg , SE 0.69 ; P = .01 ) .