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 3 Sensitivity analysis for each FPG level: association between BMI and risk of all-cause mortality

BMI (kg/m²)	NFG			IFG			T2DM
BMI (kg/m²)	Deaths (n)	Death rate^a	aHR (95%CI)	Deaths (n)	Death rate^a	aHR (95%CI)	Deaths (n)	Death rate^a	aHR (95%CI)
Excluding deaths within 2 years of follow-up
BMI < 18.5	258	44.52	1.33 (1.17–1.51)	14	30.93	0.83 (0.49–1.43)	15	68.57	1.37 (0.82–2.32)
18.5 ≤ BMI < 24	3404	26.28	1.00 (reference)	329	26.43	1.00 (reference)	315	35.15	1.00 (reference)
24 ≤ BMI < 28	1640	18.57	0.88 (0.83–0.93)	212	18.07	0.85 (0.71–1.01)	232	23.54	0.77 (0.65–0.91)
BMI ≥ 28	507	17.35	0.89 (0.81–0.98)	93	17.21	0.91 (0.72–1.15)	117	23.54	0.77 (0.62–0.95)
Excluding deaths within 2 years of follow-up and smokers
BMI < 18.5	230	45.00	1.34 (1.18–1.54)	13	31.49	0.82 (0.47–1.43)	14	74.07	1.44 (0.84–2.48)
18.5 ≤ BMI < 24	2961	26.66	1.00 (reference)	294	26.54	1.00 (reference)	280	35.16	1.00 (reference)
24 ≤ BMI < 28	1431	18.69	0.88 (0.82–0.94)	181	17.64	0.84 (0.70–1.02)	205	23.78	0.81 (0.67–0.97)
BMI ≥ 28	437	16.93	0.89 (0.80–0.98)	85	17.57	0.93 (0.73–1.19)	97	22.05	0.72 (0.57–0.91)
Excluding deaths within 2 years of follow-up, smokers, and participants with history of CHD, COPD, cancer and stroke at baseline
BMI < 18.5	175	44.01	1.37 (1.18–1.60)	10	29.38	0.66 (0.35–1.25)	11	80.44	1.68 (0.91–3.10)
18.5 ≤ BMI < 24	2370	26.37	1.00 (reference)	234	27.08	1.00 (reference)	211	34.58	1.00 (reference)
24 ≤ BMI < 28	1110	18.56	0.87 (0.81–0.94)	140	18.19	0.83 (0.67–1.03)	152	23.62	0.81 (0.65–1.00)
BMI ≥ 28	328	17.47	0.90 (0.80–1.01)	66	19.40	0.92 (0.70–1.22)	61	19.82	0.63 (0.47–0.84)

^aPer 1000 person-years. HRs and 95% CIs were calculated using Cox hazards models after adjustment for age, sex, smoking, alcohol consumption, physical activity, history of CHD, COPD, cancer and stroke, SBP and TC at baseline

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