HbA1c Cutoff Point of 5.9% Better Identifies High Risk of Progression to Diabetes among Chinese Adults: Results from a Retrospective Cohort Study

Table 2

Incidence rates of diabetes among glucose regulation subgroups after 3 years of follow-up.

	Number	Number who progressed to diabetes	Detection incidence	RR	value	Annual incidence
Various glucose tolerances
NGT	2227	100	4.5%	1		1.5%
IGR	561	110	19.6%	5.188 (3.885–6.928)	<0.001	6.5%
i-IFG	245	38	15.5%	3.905 (2.618–5.824)	<0.001	5.2%
i-IGT	179	28	15.6%	3.944 (2.514–6.188)	<0.001	5.2%
c-IGR	137	44	32.1%	10.063 (6.673–15.177)	<0.001	10.7%
Various HbA1c levels
≤5.6	986	29	2.9%	1		1.0%
5.7–5.8	557	19	3.4%	1.165 (0.647–2.098)	0.610	1.1%
5.9–6.2	813	59	7.3%	2.582 (1.639–4.069)	<0.001	2.4%
6.3–6.4	223	33	14.8%	5.732 (3.399–9.666)	<0.001	4.9%
≥6.5	209	70	33.5%	16.619 (10.408–26.536)	<0.001	11.2%
Total subjects	2778	210	7.6%			2.5%

Reference group for RR analysis from the chi-square test.