Table II.

Results of multivariable logistic regression model predicting unplanned postprocedural visit

Characteristic	Odds ratio (95% CI)	P value
Procedure
PNL	Reference	—
SWL	0.74 (0.65–0.84)	<.001
URS	0.95 (0.84–1.07)	.39
Age	0.99 (0.988–0.992)	<.001
Male	0.94 (0.91–0.98)	.004
Year	1.01 (1.00–1.02)	.02
Charlson score
0	Reference	—
1	1.32 (1.25–1.40)	<.001
≥2	1.81 (1.65–1.99)	<.001
Income*
<$25,000	Reference	—
$25,000–40,000	0.83 (0.58–1.18)	.30
$40,001–50,000	0.78 (0.55–1.11)	.18
$50,001–60,000	0.78 (0.54–1.11)	.17
>$60,000	0.83 (0.57–1.18)	.30
Education†
<75%	Reference	—
75–85%	1.07 (0.98–1.18)	.07
85–90%	1.08 (0.98–1.18)	.12
>90%	1.04 (0.93–1.16)	.46
Region
Northeast	Reference	—
North Central	0.97 (0.88–1.06)	.44
South	0.80 (0.73–0.87)	<.001
West	0.84 (0.76–0.93)	.001
Unknown	0.81 (0.53–1.24)	.33
High-volume facility‡	0.80 (0.74–0.87)	<.001

^*Median household income.

^†Percent of population with at least high school diploma.

^‡Procedure-specific: ≥ 90th percentile for the procedure.

PNL, Percutaneous nephrostolithotomy; SWL, shock wave lithotripsy; URS, ureteroscopy.