Table 1:

Population specifications

BMI Level^a	Under-Normal -Overweight^b	Class I	Class II	Class III	Total Sample
N	39,621	11,597	5,193	3,438	59,849
% Percentage	66.20	19.38	8.68	5.74	100.00

Demographics
% Female	59.34	48.66	57.42	66.67	57.53
Age in 2012	44.44	47.55	47.72	47.42	45.50
% Age 20–34	24.73	15.05	14.54	14.89	21.41
% Age 35–44	21.06	20.77	20.99	21.32	21.01
% Age 45–54	27.79	31.84	31.25	32.34	29.13
% Age 55–64	26.42	32.34	33.22	31.44	28.45

Comorbidity in 2012^c
Charlson Index	0.13	0.19	0.22	0.28	0.16
# Chronic Conditions	1.63	2.27	2.61	3.14	1.92
# Rx Ingredients	3.11	3.82	4.40	4.92	3.46
Dx-PM Score	1.11	1.31	1.45	1.62	1.21
% Type-1 Diabetes	1.05	1.07	1.23	0.70	1.05
% Type-2 Diabetes	2.76	9.18	14.08	20.19	5.99
% Hypertension	11.68	26.33	34.07	40.55	18.12
% Ischemic Heart	1.33	2.95	2.79	2.39	1.83
% Acute Myocardial Infarction	0.19	0.33	0.33	0.15	0.23
% Obesity^d	0.50	8.15	18.14	35.19	5.51

Utilization
# IP in 2012	0.04	0.06	0.06	0.07	0.05
# ED in 2012	0.13	0.17	0.17	0.21	0.14
% Any IP in 2012	3.21	4.65	4.81	5.67	3.77
% Any ED in 2012	10.06	12.51	13.15	15.68	11.13
% Top 5% cost in 2012	4.30	5.85	6.64	7.82	5.01
# IP in 2013	0.03	0.05	0.06	0.09	0.04
# ED in 2013	0.11	0.14	0.16	0.20	0.12
% Any IP in 2013	2.54	3.96	4.56	7.04	3.25
% Any ED in 2013	8.60	10.55	12.75	14.51	9.68
% Top 5% cost in 2013	4.00	5.87	7.36	10.15	5.01
Cost in $^e
Total Cost in 2012	4618	5625	6247	7158	5100
Medical cost in 2012	3880	4731	5114	5901	4268
Pharmacy in 2012	695	870	1096	1223	794
Total Cost in 2013	4333	5572	6336	7957	4955
Medical cost in 2013	3551	4613	5126	6516	4064
Pharmacy in 2013	741	940	1176	1363	853

^(a)

statistical significance of utilization differences among different BMI-levels was not calculated as p-value is not very informative in large populations (i.e., all p-values were significant at .001 level);

^(b)

under 587 (0.98%), normal 19,162 (32.02%), and overweight 19,872 (33.20%);

^(c)

generated by the ACG system using diagnosis codes of both claims and EHR data;

^(d)

diagnosis of obesity captured as a diagnostic code in the EHR and/or claims; and,

^(e)

cost is truncated at top 0.5%.

ED: Emergency Department; IP: Inpatient; Rx: Medication