. 2021 Feb 8;23(2):e23400. doi: 10.2196/23400

Table 4.

Results of the binary logistic regression analysis of factors that were significantly associated with environmental factors.

Demographic characteristics			Close contact with >10 people			Living with >5 cohabitants				Stopped going to work/school
			OR (95% CI)	P value		OR (95% CI)		P value		OR (95% CI)		P value
Opinion of infection			1.02 (1.02-1.02)^a	<.001		1.00 (1.00-1.00)		.85		0.99 (0.99-0.99)^a		<.001
Gender
	Female	0.96 (0.90-1.02)		.21	1.10 (1.00-1.22)		.053		1.11 (1.05-1.17)^a		<.001
	Male	1.0 (referent)		N/A^b	1.0 (referent)		N/A		1.0 (referent)		N/A
Number of COVID-19 cases in a participant’s state of current residence
	0-1000	1.25 (0.94-1.66)		.12	1.13 (0.77-1.66)		.53		0.80 (0.66-0.98)^c		.03
	1001-5000	1.82 (1.52-2.18)^a		<.001	1.08 (0.84-1.40)		.54		0.66 (0.58-0.75)^a		<.001
	5001-10,000	1.89 (1.57-2.28)^a		<.001	1.09 (0.84-1.42)		.54		0.68 (0.59-0.78)^a		<.001
	10,001-20,000	1.58 (1.32-1.89)^a		<.001	1.12 (0.88-1.44)		.36		0.78 (0.68-0.88)^a		<.001
	20,001-40,000	1.45 (1.21-1.73)^a		<.001	1.07 (0.83-1.37)		.61		0.84 (0.74-0.95)^d		.005
	≥40,001	1.0 (referent)		N/A	1.0 (referent)		N/A		1.0 (referent)		N/A
Age (years)
	0-20	1.05 (0.96-1.15)		.34	2.05 (1.80-2.33)^a		<.001		1.68 (1.56-1.81)^a		<.001
	20-40	1.0 (referent)		N/A	1.0 (referent)		N/A		1.0 (referent)		N/A
	40-60	0.70 (0.64-0.76)^a		<.001	0.86 (0.75-0.99)^d		.04		1.03 (0.96-1.10)		.48
	>60	0.32 (0.28-0.36)^a		<.001	0.25 (0.20-0.31)^a		<.001		0.50 (0.46-0.55)^a		<.001
BMI^e
	Underweight (BMI<18.5 kg/m²)	0.82 (0.65, 1.03)		.09	0.87 (0.65-1.16)		.35		1.13 (0.94-1.35)		.19
	Normal weight (BMI=18.5-24.9 kg/m²)	1.0 (referent)		N/A	1.0 (referent)		N/A		1.0 (referent)		N/A
	Preobesity (BMI=25-29.9 kg/m²)	1.16 (1.06-1.27)^d		.001	1.01 (0.88-1.15)		.91		0.88 (0.82-0.94)^a		<.001
	Obesity (BMI≥30 kg/m²)	1.28 (1.18-1.39)^a		<.001	1.06 (0.94, 1.20)		.32		0.76 (0.71-0.81)^a		<.001
Smoking status
	Never	1.0 (referent)		N/A	1.0 (referent)		N/A		1.0 (referent)		N/A
	Quit	1.06 (0.97-1.17)		.19	1.02 (0.88-1.18)		.80		0.83 (0.62-0.89)^a		<.001
	Vape	1.41 (1.26-1.58)_a		<.001	1.13 (0.96-1.33)		.15		0.68 (0.73-0.75)^a		<.001
	Yes	1.68 (1.52-1.86)^a		<.001	1.37 (1.17-1.60)^a		<.001		0.58 (0.53-0.63)^a		<.001
Alcohol consumption status
	Never	1.0 (referent)		N/A	1.0 (referent)		N/A		1.0 (referent)		N/A
	None in last 14 days	1.38 (1.25-1.53)^a		<.001	0.94 (0.82-1.08)		.39		0.95 (0.88-1.03)		.24
	Some in last 14 days	1.30 (1.19-1.42)^a		<.001	0.72 (0.64-0.82)^a		<.001		1.17 (1.10-1.26)^a		<.001
Nonprescription/recreational drug use status
	Never	1.0 (referent)		N/A	1.0 (referent)		N/A		1.0 (referent)		N/A
	None in last 28 days	0.87 (0.80-0.94)^c		.001	0.91 (0.80-1.03)		.14		1.16 (1.09-1.24)^a		<.001
	Some in last 28 days	0.79 (0.72-0.87)^a		<.001	0.90 (0.78-1.04)		.15		1.18 (1.09-1.27)^a		<.001
Underlying medical conditions
	Have	0.84 (0.79-0.91)^a		<.001	1.05 (0.95-1.17)		.37		1.09 (1.03-1.15)^d		.003
	None	1.0 (referent)		N/A	1.0 (referent)		N/A		1.0 (referent)		N/A

^aSignificant at a level of P<.001.

^bN/A: not applicable.

^cSignificant at a level of P<.05.

^dSignificant at a level of P<.01.

^eBMI: body mass index.