Table 1.

Characteristics of admitted and discharged ED patients with a documented ambulatory oxygen saturation.

Patient characteristics	Admitted N (%) or Mean (SD)	Discharged N (%) or Mean (SD)	Significance P-value
Total patients	165	519
Age
Mean	56	47	< 0.01
Median	58	47	< 0.01
Interquartile range	47 to 66	37 to 57
18 to 29	5 (3%)	53 (10%)
30 to 39	17 (10%)	119 (23%)
40 to 49	30 (18%)	108 (21%)
50 to 59	36 (22%)	137 (26%)
60 to 69	51 (31%)	72 (14%)
70 to 79	23 (14%)	26 (5%)
80 and up	3 (2%)	4 (1%)
Sex
Male	94 (57%)	270 (52%)	0.27
Female	51 (43%)	249 (48%)
Body-Mass-Index*
20 to 25	22 (16%)
25 to 30	53 (39%)
30 to 35	31 (23%)
40 to 45	18 (13%)
45 and Up	4 (9%)
Comorbidities
Hypertension	73 (44%)	97 (19%)	< 0.01
Hyperlipidemia	43 (26%)	88 (17%)	0.01
Diabetes	34 (20%)	57 (11%)	< 0.01
Coronary artery disease	7 (4%)	20 (4%)	0.82
Congestive heart failure	2 (1%)	5 (1%)	0.78
Asthma	20 (12%)	42 (8%)	0.12
COPD	1 (1%)	4 (1%)	0.83
Cancer	9 (5%)	28 (5%)	0.98
Cirrhosis	2 (1%)	0 (0%)	0.01
Chronic kidney disease	6 (4%)	13 (3%)	0.44
End-stage renal disease	2 (1%)	2 (0%)	0.23
Immunosuppression	10 (6%)	6 (1%)	< 0.01
Triage vital signs
Temperature	99.8 (1.5)	99.5 (1.3)	< 0.01
Heart rate	97 (17)	97 (16)	0.58
Systolic blood pressure	132 (18)	132 (17)	0.74
Diastolic blood pressure	77 (11)	81 (11)	< 0.01
Respirations	20 (3)	20 (3)	0.02
Triage oxygen saturation
Average	95 (2)	97 (2)	< 0.01
Median	95	97	< 0.01
Range	90 to 100	90 to 100
Ambulatory oxygen saturation
Average	89 (4)	96 (2)	< 0.01
Median	89	96	< 0.01
Range	71 to 97	86 to 100	< 0.01

COPD, Chronic obstructive pulmonary disease.

^*Only 24 of the 519 discharged patients had a height and weight measurement to calculate a body-mass-index, therefore these values are not reported.