From 1 to 5 years , median HbA1c interquartile range increased from 6.3 % ( 5.9-6 .8 ) to 6.8 % ( 6.4-7 .4 ) ; the median ADDQoL score and mean health status physical health summary score decreased from -0.4 ( -1 to -0.08 ) to -0.5 ( -1.08 to -0.09 ) ( suggesting an adverse impact of diabetes on QoL ) and by -0.79 ( 8.94 ) points , respectively .