Fig. 4

Mean (± SD) HbA1c (%) according to: (a) age at investigation (p = 0.004 between age groups 5–9 and 15–19 years); (b) age at onset of diabetes (p < 0.05 between age at onset 0.5–4 years group and 5–9, 10–14, 15–19 and ≥20 year groups; p = 0.036 between age at onset groups 5–9 and 10–14 years); (c) diabetes duration (p = 0.003 between groups 0–4 and 10–14 years; p = 0.024 between groups 5–9 and 10–14 years)