Supplementary Table 1.

Patient and Room Information for 10 Upper Endoscopies and 10 Colonoscopies

Patient No.	Proc type	θ, o		L, cm		Humidity,% RH	Temp, C°	POM mask	Pre-Proc, min	Proc, min	Post-Proc, min
		Min	Max	Min	Max
1	Colon	0	10	60	90	44	21.5	n/a	8.5	19.2	8.0
2	Colon	0	10	60	75	45	21.5	n/a	7.1	18.7	10.1
3	EGD	5	15	30	45	45	22.0	No	6.1	10.6	9.2
4	EGD	0	30	30	45	45	22.0	No	12.5	13.8	10.6
5	Colon	0	10	60	90	45	22.0	n/a	5.5	25.8	12.8
6	EGD	0	15	30	50	43	21.5	No	13.3	9.2	8.2
7	EGD	0	10	20	45	43	21.5	No	7.7	4.5	8.5
8	Colon	0	10	45	90	44	21.5	n/a	12.0	21.3	12.6
9	Colon	0	10	60	90	43	21.5	n/a	6.5	23.7	10.6
10	Colon	0	10	60	90	43	21.5	n/a	8.0	32.7	15.3
11	EGD	0	10	30	45	36	20.5	Yes	4.8	6.6	9.3
12	EGD	5	15	30	45	34	20.5	Yes	8.0	10.3	5.5
13	Colon	−5	5	60	90	32	21.0	n/a	7.1	18.8	12.0
14	EGD	5	35	30	45	30	21.5	Yes	7.6	5.4	1.5
15	EGD	0	25	30	45	29	21.5	Yes	7.4	8.4	7.6
16	Colon	−5	5	45	90	28	21.5	n/a	4.0	19.0	18.5
17	EGD	0	25	30	45	28	21.5	Yes	9.9	7.6	3.5
18	EGD	0	10	30	45	28	22.0	Yes	6.6	3.2	5.7
19	Colon	−10	0	60	90	29	22.0	n/a	3.4	15.5	10.2
20	Colon	−10	0	45	60	29	21.5	n/a	7.3	15.7	5.8

NOTE. During some esophagogastroduodenoscopy (EGD) procedures (Proc), the patient wore a procedural oxygen mask (POM). Angle (θ) and distance (L) notation are illustrated in Figure 1E. Angles are defined relative to the oral axis for upper endoscopies, with positive angles toward the nose of the patient. Angles are defined relative to the anal canal axis for colonoscopies, with positive angles towards the patient front. The mean ± standard error duration of the upper endoscopies and colonoscopies was 7.9 ± 1.0 minutes and 21.0 ± 1.6 minutes, respectively. The mean duration of the preprocedure (Pre-Proc) control and postprocedure control (Post-Proc) was 7.7 ± 0.6 minutes and 9.3 ± 0.9 minutes, respectively.

Max, maximum; Min, minimum; n/a, not applicable; RH, relative humidity.