Table 1.

Sample characteristics.

	N (%)	Average cost		P -value	Average length of stay		P -value
		Mean	SD		Mean	SD
Sex				0.828			0.659
Male	2,419 (66.92%)	7,955.78	106.12		65	0.81
Female	1,196 (33.08%)	7,993.53	154.26		65	1.12
Age				P < 0.001			P < 0.001
0–20	105 (2.79%)	4,542.39	273.23		41	2.53
20–40	615 (16.32%)	6,319.15	200.14		53	1.48
40–60	1,507 (39.98%)	7,800.70	129.69		64	1.02
60–80	1,072 (28.44%)	8,808.24	166.93		69	1.19
>80	470 (12.47%)	8,756.73	240.79		72	1.81
Type of disease				P < 0.001			P < 0.001
Tumors	169 (4.48%)	5,083.97	350.08		38	2.64
Mental and behavioral disorders	25 (0.66%)	7,982.80	1,321.22		70	11.72
Neurological diseases	328 (8.70%)	8,637.93	408.84		70	2.75
Circulatory system diseases	2,413 (64.02%)	8,446.89	96.58		68	0.73
Diseases of the skeletal muscle system and connective tissue	245 (6.50%)	2,648.85	96.38		21	0.86
Injury, poisoning, and certain other results of exogenous effects	147 (3.90%)	8,491.56	342.95		77	2.86
Factors affecting health status and exposure to health services	194 (5.15%)	6,582.26	323.08		54	2.33
Other diseases	248 (6.58%)	8,985.65	392.60		75	2.99
Nature of the hospital				P < 0.001			P < 0.001
Public	722 (19.16%)	5,796.73	180.93		53	1.70
Private	3,047 (80.84%)	8,366.18	93.97		67	0.67
Grade of the hospital				P < 0.001			P < 0.001
Primary	2,454 (65.11%)	7,373.24	97.69		64	0.77
Secondary	344 (9.13%)	2,787.64	113.29		22	0.91
Tertiary	971 (25.76%)	10,941.40	163.69		79	1.17