Table 4.

Multivariable analyses of levels of anti-SARS-CoV-2 receptor binding domain-specific immunoglobulin class G (IgG) antibodies (logarithm base 10-transformed) against various factors and covariates. The analysis involved 909 unvaccinated individuals with a reported history of SARS-CoV-2 infection.

	(1)	(2)	(3)	(4)
Variables	Model 1– Characteristics of Participants	Model 2–Symptoms	Model 3–Hospital Admission	Model 4–Overall
Fever (Yes)		0.149 ***		0.100 **
		(0.044)		(0.042)
Cough (Yes)		0.143 ***		0.109 ***
		(0.043)		(0.040)
Shortness of breath (Yes)		0.112 **		0.028
		(0.048)		(0.046)
Diarrhea (Yes)		0.132 ***		0.075
		(0.050)		(0.047)
Symptoms Duration (in days)		0.002 **		0.001
		(0.001)		(0.001)
At Least two Symptoms (Yes)		−0.029		0.116 *
		(0.081)		(0.068)
Time difference between date of symptoms and date of antibody test		−0.0011 ***
		(0.000)
Age (in Years)	0.011 ***			0.020 ***
	(0.001)			(0.001)
Gender (Female)	−0.134 ***			−0.102 **
	(0.040)			(0.040)
BMI (kg/m2)	0.019 ***			0.015 ***
	(0.004)			(0.004)
Smoking Status (Yes)	−0.238 ***			−0.201 ***
	(0.054)			(0.055)
Health Care Workers (Yes)	−0.107 *			−0.064
	(0.062)			(0.061)
Time difference between date of first diagnostic test for SARS-CoV-2 (antigen-based or molecular) and date of antibody test	−0.001 ***			−0.001 ***
	(0.000)			(0.000)
Hospital Admission (Yes)			0.734 ***	0.415 ***
			(0.080)	(0.082)
Constant	1.891 ***	2.591 ***	2.613 ***	1.793 ***
	(0.112)	(0.081)	(0.020)	(0.125)
Observations	930	833	956	844
R-squared	0.170	0.080	0.081	0.251

Standard errors in parentheses *** p < 0.001, ** p < 0.05, * p < 0.1.