After 1-year , the HbA1c failure rate was 0.36 [ 95 % CI , 0.28-0 .47 ] per quarter for the group medical visit arm , 0.24 [ 95 % CI , 0.18-0 .33 ] per quarter for the quarterly CRRC individual arm and , 0.82 [ 95 % CI , 0.69-0 .96 ] per quarter for the usual care control arm , p < 0.001 .