Associations of BMI with all-cause mortality in normoglycemia, impaired fasting glucose and type 2 diabetes mellitus among an elderly Chinese population: a cohort study

Table 2 BMI and all-cause mortality for each FPG level

Variables	BMI < 18.5	18.5 ≤ BMI < 24	24 ≤ BMI < 28	BMI ≥ 28	P for trend	Increase per SD^b
NFG
Deaths	291	3795	1811	560
Death rate^a	48.38	28.46	19.82	18.48
Model 1	1.71 (1.52–1.93)	1.00 (reference)	0.70 (0.66–0.74)	0.65 (0.59–0.71)	< 0.001	0.78 (0.76–0.80)
Model 2	1.33 (1.18–1.49)	1.00 (reference)	0.88 (0.83–0.93)	0.90 (0.82–0.98)	< 0.001	0.92 (0.89–0.94)
IFG
Deaths	17	364	231	100
Death rate^a	36.15	28.37	19.07	17.79
Model 1	1.31 (0.81–2.13)	1.00 (reference)	0.68 (0.58–0.80)	0.65 (0.52–0.81)	< 0.001	0.81 (0.75–0.88)
Model 2	0.89 (0.55–1.46)	1.00 (reference)	0.84 (0.71–0.99)	0.88 (0.70–1.11)	0.169	0.96 (0.89–1.04)
T2DM
Deaths	18	355	256	130
Death rate^a	79.46	38.19	24.88	25.04
Model 1	2.11 (1.31–3.38)	1.00 (reference)	0.66 (0.56–0.78)	0.67 (0.54–0.81)	< 0.001	0.79 (0.73–0.85)
Model 2	1.42 (0.88–2.29)	1.00 (reference)	0.75 (0.64–0.89)	0.76 (0.62–0.93)	< 0.001	0.86 (0.80–0.93)

^aPer 1000 person-years; ^bStandard deviations for BMI: 3.2 kg/m² in NFG group, 3.5 kg/m² in IFG group, and 3.5 kg/m² in T2DM group. Model 1 is unadjusted; Model 2 is adjusted for age, sex, smoking, alcohol consumption, physical activity, history of CHD, COPD, cancer and stroke, SBP and TC at baseline

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