Table 3.

Odds of Supplemental Oxygen Use by Patient Residence Location, Sociodemographic, Clinical, and Environmental Characteristics (n = 34,761)

Patient Characteristics	Odds Ratio (CI*)	P Value
Residence location
Urban	0.91 (0.85, 0.98)	.016
Large rural	1.0 (ref)	—
Small rural	0.90 (0.83, 0.99)	.031
Isolated small rural	0.98 (0.89, 1.09)	.754
Age (years)
<65	1.46(1.35, 1.58)	.000
65-69	1.64 (1.52, 1.76)	.000
70-74	1.67 (1.56, 1.78)	.000
75-79	1.49 (1.40, 1.59)	.000
80+	1.0 (ref)	—
Sex
Male	1.53 (1.46, 1.61)	.000
Female	1.0 (ref)	—
Race
White	1.57 (1.46, 1.69)	.000
Nonwhite	1.0 (ref)	—
Number of hospital admissions during study period
1	1.0 (ref)	—
2	2.02 (1.90, 2.16)	.000
3+	3.26 (3.00, 3.53)	.000
Elevation of residence location
0-500 feet	1.0 (ref)	—
501-1,000 feet	1.09 (1.03, 1.15)	.002
1,001-2,000 feet	1.17 (1.08, 1.26)	.000
2,001-3,000 feet	1.25 (1.08, 1.44)	.003
3,001-4,000 feet	1.89 (1.57, 2.27)	.000
4,001 + feet	2.85 (2.48,3.28)	.000
Median household income in ZIP code
≤$20,000	1.0 (ref)	—
$20,001-$25,000	1.20 (1.07, 1.35)	.002
$25,001-$30,000	1.27 (1.13, 1.42)	.000
$30,001-$40,000	1.37 (1.22, 1.53)	.000
$40,001-$50,000	1.41 (1.26, 1.59)	.000
$50,001 +	1.27 (1.12, 1.43)	.000
Charlson comorbidity index
0	1.0 (ref)	—
1	1.11 (1.05, 1.17)	.000
2	1.05(0.98, 1.13)	.140
3+	1.08(1.00, 1.17)	.056

^*CI, confidence interval.

Missing values: race/ethnicity 154, income 1.