Table 3.

Charges and characteristics of inpatient admission for gout as primary diagnosis after an ED visit and charges for inpatient admission with gout as primary or secondary diagnosis.

Variables	2009 NEDS	2010 NEDS	2012 NEDS
Gout as the primary diagnosis for hospitalization after an ED visit
All gout inpatient admissions with gout as primary diagnosis^* for those with ED visits	15,287	17,422	15,870
Total inpatient charges, US$	264,984,858	321,435,900	313,448,370
Length of hospital stay, days
Mean (SD)	4.15 (4.42)	4.00 (4.13)	3.86 (3.38)
Median (IQR)	2.82 (1.65–4.89)	2.75 (1.53–4.53)	2.58 (1.46–4.24)
Total charges, ED and inpatient, for admitted patients, US$	299,472,330	357,098,734	350,187,420
Total charges^**, ED and inpatient, per visit for admitted patients, US$
Mean (SD)	19,590 (35,000)	20,497 (38,073)	22,066 (17,070)
Median (IQR)	13,609 (8093–23,246)	14,862 (8888–24,429) 15,912	(9655–26,764)
Gout as primary or secondary diagnosis for hospitalization after an ED visit
All gout inpatient admissions with gout in any position, primary or secondary, after an ED visit	445,934	472,470	498,296
Total inpatient charges, US$	12,671,214,610	13,896,287,640	16,118,879,008
Length of hospital stay, days, mean (SE)	4.96 (14.93)	4.81 (12.29)	4.69 (15.78)
Total charges for ED and inpatient services, US$	14,150,823,622	15,375,118,740	18,314,869,480

↵* Gout International Classification of Diseases-9-Clinical Modification code 274.xx listed as the primary diagnosis.
↵** Numbers were rounded to the nearest whole digit. ED: emergency department; NEDS: US National ED Sample; IQR: interquartile range; SE: standard error.