HbA1c < 6.5 % at transition predicted final HbA1c < 6.5 % ( crude RR 4.9 [ 95 % CI 4.0 , 5.9 ] ; RR 3.9 [ 95 % CI 3.2 , 4.8 ] adjusted for demographics , co-interventions , pre-intervention HbA1c , BMI and glucose-lowering medication , and post-transition change in both BMI and glucose-lowering medication ) .