Table 1.

Frequency distribution of baseline characteristics by body mass index (BMI) group in patients with acute heart failure.

BMI groups Kg/m2	≤19 Under-weight	20–25 Normal-weight	26–30 Over-weight	31–35 Obese I group	36–39 Obese II group	≥40 Extremely obese	Total	P-value
Unweighteda	2,784 (6.3)	2,529 (5.8)	3,545 (8.1)	7,159 (16.3)	6,248 (14.2)	21,725 (49.4)	43,990
Weightedb	13,920	12,645	17,725	35,795	31,240	108,625	219,950
Age group, %, years								<0.001
18–44	2.6	2.2	3.6	4.6	6.6	10.1	7.3
45–59	7.5	8.5	14.0	18.8	23.2	29.9	23.2
60–74	23.7	24.6	33.7	40.0	41.6	42.7	39.1
>75	66.2	64.7	48.7	36.6	28.6	17.3	30.4
Gender, %								<0.001
Male	61.8	48.7	44.3	44.3	46.8	56.1	51.8
Female	38.2	51.2	55.6	55.7	53.2	43.9	48.1
Race, %								<0.001
White	69.3	67.3	64.1	63.1	62.9	60.9	62.7
Non-white	25.6	27.4	31.1	31.8	32.1	34.0	32.2
Comorbidity, %
Hypertension	38.3	36.4	38.5	41.6	43.9	43.5	42.1	<0.001
Diabetes mellitus	17.2	25.7	44.1	49.3	51.8	53.7	48.0	<0.001
Chronic renal disease	39.5	46.7	50.9	48.9	46.5	44.8	46.0	<0.001
Chronic obstructive pulmonary disease	46.6	37.3	41.3	45.0	47.6	52.7	48.6	<0.001
Peripheral vascular disease	23.5	25.4	25.8	24.1	21.3	15.8	19.8	<0.001
Atrial Fibrillation/Flutter	47.4	49.0	45.6	44.6	43.1	40.7	43.0	<0.001
Prior MI	14.0	16.3	18.4	17.8	14.5	11.3	13.8	<0.001
Deyo-CCI, %								<0.001
1	6.6	6.7	4.3	4.3	4.6	5.1	5.0
2 or higher	93.4	93.3	95.7	95.7	95.4	94.9	95.0
Outcome
Mortality	5.5	5.5	2.8	1.6	1.4	1.6	2.2	<0.001
Length of Stay	6.46 ± 0.15	6.7 ± 0.15	5.9 ± 0.08	5.4 ± 0.08	5.4 ± 0.07	6.0 ± 0.05	5.9 ± 0.04	<0.001

BMI, Body Mass Index (Kg/m²); Deyo-CCI, Deyo-Charlson Comorbidity Index; MI, Myocardial Infraction.

^aRepresents the number of observations in the NIS database.

^bRepresents total national estimates after applying sampling weights.