Table 4. Multivariable logistic regression for analysis of factors associated with chemotherapy following nephrostomy.

Demographic category		OR	P value	95% CI
Sex	Male (baseline)
	Female	1.09	0.176	0.96 to 1.24
Age (years)	18–29	4.04	<0.001	2.66 to 6.12
	30–39	3.07	<0.001	2.37 to 3.97
	40–49	2.80	<0.001	2.33 to 3.38
	50–59	2.49	<0.001	2.16 to 2.86
	60–69	2.12	<0.001	1.89 to 2.38
	70+ (baseline)
Ethnicity	White (baseline)
	Asian	0.94	0.645	0.72 to 1.23
	Other minority ethnicity	1.04	0.734	0.81 to 1.35
	Unknown	0.63	0.004	0.46 to 0.86
Comorbidity score	0 (baseline)
	1–4	0.79	0.001	0.69 to 0.91
	5+	0.53	<0.001	0.47 to 0.59
IMD deprivation quintiles	1 (most deprived) (baseline)
	2	1.18	0.034	1.01 to 1.37
	3	1.07	0.386	0.92 to 1.25
	4	1.29	0.001	1.11 to 1.50
	5 (least deprived)	1.58	<0.001	1.36 to 1.84
Procedure year	2010–2011 (baseline)
	2012–2013	1.06	0.441	0.91 to 1.23
	2014–2015	1.14	0.086	0.98 to 1.32
	2016–2017	1.31	<0.001	1.13 to 1.52
	2018–2019	1.44	<0.001	1.24 to 1.67
Provider cancer volume tertile	1–1576 (baseline)
	1577–3079	0.94	0.471	0.81 to 1.10
	3080+	1.07	0.428	0.91 to 1.25
Inpatient/outpatient	Inpatient	0.41	<0.001	0.35 to 0.48
	Outpatient (baseline)
Cancer type	Genitourinary (baseline)
	Gynaecological oncology	1.25	0.009	1.06 to 1.47
	Digestive	1.08	0.264	0.94 to 1.24
	Other	0.71	<0.001	0.59 to 0.84
Specialty	Urology (baseline)
	Medicine	0.63	<0.001	0.55 to 0.72
	Oncology	1.60	<0.001	1.40 to 1.83
	General surgery	0.85	0.085	0.71 to 1.02
	Gynaecology/gynaecological oncology	1.64	<0.001	1.28 to 2.10
	Other	0.82	0.092	0.65 to 1.03
Nephrostomy performed at provider with radiotherapy unit		1.08	0.196	0.96 to 1.21

p values < 0.001 are in bold.

IMDIndex of Multiple Deprivation