Analysis of hospitalization costs related to fall injuries in elderly patients

Table 3 Quantile regression analysis of hospitalization costs

Variable	Hospitalization costs
	Q10	Q50	Q90
Operations times	0.038	0.067b	0.133b
LOS	0.162b	0.174b	0.228b
Age	0.038b	0.018b	0.003
Gender (Contrast = Male)
Female	0.01	0.018	0.026a
Payment methods (Contrast = Worker medical insurance)
Resident medical insurance	0.005	0.007	-0.008
Commercial medical insurance	-0.35	-0.751b	-1.185b
Individual medical care	0.176	0.034	-0.017
Public medical care	-0.184b	-0.019	0.006
Other	-0.057	0.054	-0.107
Wound position (Contrast = None)
Trunk	-0.277	0.063	0.646b
Upper limbs	-0.393	-0.066	0.502a
Head and neck	-0.117	0.317	0.763b
Prosthesis	-0.227	0.049	0.500
Organ	-0.314	0.2	0.760b
Spinal cord	-0.342	-0.037	0.497a
Lower limbs	-0.305	0.022	0.584a
Wound type (Contrast = Dislocation)
Contusion	0.890b	-0.153a	-0.187a
Soft tissue injury	0.942b	-0.052	-0.08
Joint injury	0.757b	-0.06	-0.112
Visceral rupture	0.851b	0.015	0.047
Fracture	0.900b	0.068	-0.006
Other	0.735b	-0.162a	-0.025
Operation type (Contrast = None)
Fixation	-0.024	-0.071a	-0.209b
Debridement and suturing	0.523b	0.704b	0.480b
Surgical exploration	0.413b	0.317b	0.202b
Open reduction	0.883b	0.666b	0.319b
Replacement	1.023b	0.717b	0.355b
Decompression	1.100b	0.837b	0.608b
Other	0.276b	0.452b	0.286b
Pseudo R2	0.5467	0.4767	0.3848

^aP < 0.05.

^bP < 0.01. LOS: Length of stay.