Article Figures & Data
Figures
- Appendix Figure 1.
Receiver Operating Characteristic (ROC) Curve and Dot Plot for Saliva Assay.
Tables
- Table 1.
Characteristics of Study Participants with Both Valid Antibody Result and Completed Survey (n = 428)
Antibody Result (> 61.85 ng/mL) Total (n = 428) Positive (n = 145) Negative (n = 283) Age Mean (SD) 20.6 (2.28) 20.4 (2.20) 20.7 (2.32) Sex Male 133 (31.1%) 54 (37.2%) 79 (27.9%) Female 294 (68.7%) 91 (62.8%) 203 (71.7%) Other 1 (0.2%) 0 (0%) 1 (0.4%) Race Alaska Native/Native American 1 (0.2%) 0 (0%) 1 (0.4%) Asian/Pacific Islander 21 (4.9%) 10 (6.9%) 11 (3.9%) Black/African American 21 (4.9%) 4 (2.8%) 17 (6.0%) White 365 (85.3%) 125 (86.2%) 240 (84.8%) Multiracial 18 (4.2%) 5 (3.4%) 13 (4.6%) Not Reported 2 (0.5%) 1 (0.7% 1 (0.4%) Year in School Undergraduate Year 1/2 177 (41.4%) 64 (44.1%) 113 (39.9%) Undergraduate Year 3/4/5 216 (50.5%) 70 (48.3%) 146 (51.6%) Graduate or Professional 35 (8.2%) 11 (7.6%) 24 (8.5%) Housing UGA Dormitory 117 (27.3%) 43 (29.7%) 74 (26.1%) Fraternity/Sorority House 42 (9.8%) 13 (9.0%) 29 (10.2%) Apartment/Condo 185 (43.2%) 59 (40.7%) 126 (44.5%) Living at Home with Parents/Guardians 21 (4.9%) 8 (5.5%) 13 (4.6%) Rental or Other Home 63 (14.7%) 22 (15.2%) 41 (14.5%) Number Sharing Household 0–2 Roommates 197 (46.0%) 77 (53.1%) 120 (42.4%) >2 Roommates 217 (50.7%) 64 (44.1%) 153 (54.1%) Missing 14 (3.3%) 4 (2.8%) 10 (3.5%) Mask-Wearing Off Campus Almost Always 230 (53.7%) 78 (53.8%) 152 (53.7%) Sometimes 148 (34.6%) 53 (36.6%) 95 (33.6%) Rarely or Never 49 (11.4%) 14 (9.7%) 35 (12.4%) Number of Parties/Bars Attended During Fall Semester 0–1 Time 180 (42.1%) 53 (36.6%) 127 (44.9%) 2–5 Times 109 (25.5%) 35 (24.1%) 74 (26.1%) 6–10 Times 50 (11.7%) 18 (12.4%) 32 (11.3%) 11 or More Times 89 (20.8%) 39 (26.9%) 50 (17.7%) At Least One Roommate Positive Yes 195 (45.6%) 79 (54.5%) 116 (41.0%) No 228 (53.3%) 63 (43.4%) 165 (58.3%) Missing 5 (1.2%) 3 (2.1%) 2 (0.7%) Abbreviations: SD, standard deviation.
- Table 2.
Results of Logistic Regression with Presence of Antibodies (> 61.85 ng/mL) as the Dependent Variable
Risk Factor Univariate OR (95% CI) Adjusted OR (95% CI) P* Age (years) 0.95 (0.87–1.05) 0.97 (0.84–1.13) 0.698 Male sex 1.53 (1.00–2.34) 1.66 (1.03–2.67) 0.036 Non-White race 0.93 (0.47–1.82) 1.05 (0.49–2.26) 0.896 Year in School Undergraduate year 1/2 Ref Ref Undergraduate year 3/4/5 0.85 (0.56-1.29) 0.92 (0.46 – 1.82) 0.803 Graduate 0.81 (0.37-1.76) 0.62 (0.18 – 2.17) 0.453 Housing Dormitory Ref Ref Greek 0.77 (0.36-1.64) 1.08 (0.38 – 3.04) 0.884 Apartment 0.81 (0.50–1.31) 1.57 (0.70 – 3.50) 0.273 At Home 1.06 (0.41-2.76) 2.68 (0.87 – 8.22) 0.085 Rental Home 0.92 (0.49-1.75) 2.24 (0.82 – 6.11) 0.117 Mask-Wearing Off Campus Almost always Ref Ref Sometimes 1.09 (0.70–1.68) 1.01 (0.61 – 1.67) 0.968 Rarely or Never 0.78 (0.40–1.53) 0.56 (0.26 - −1.20) 0.134 Number of Parties/Bars Attended During Fall Semester 0–1 Ref Ref 2–5 1.13 (0.68–1.89) 1.11 (0.63–1.99) 0.708 6–10 1.35 (0.70–2.61) 1.19 (0.55–2.55) 0.658 11+ 1.87 (1.10–3.17) 1.65 (0.86–3.15) 0.130 At Least One Roommate Positive 1.78 (1.19–2.68) 1.92 (1.18–3.12) 0.009 Number Sharing Housing >2 0.65 (0.43–0.98) 0.41 (0.23–0.72) 0.002 ↵* For adjusted multiple variable logistic regression.
Abbreviations: OR, odds ratio; CI, confidence interval.
Confirmed COVID-19 (n = 140) Symptoms Yes 122 (87.1%) No 18 (12.9%) Persistent Symptoms Yes 14 (10.0%) No 126 (90.0%) Number of Days with Persistent Symptoms (n = 14) Mean (SD) 132 (22.5) Median [Min, Max] 131 [12, 253] Abbreviations: SD, standard deviation.
- Appendix Table 1.
Sensitivity and Specificity of Different Antibody Titer Cutoffs for the Diagnosis of Previous Infection With SARS-CoV-2
Antibody Titer Sensitivity (%) 95% CI Specificity (%) 95% CI > 22.90 100 70.09%–100.0% 11.11 0.5699%–43.50% > 39.16 100 70.09%–100.0% 22.22 3.948%–54.74% > 43.22 100 70.09%–100.0% 33.33 12.06%–64.58% > 44.62 100 70.09%–100.0% 44.44 18.88%–73.33% > 46.34 88.89 56.50%–99.43% 44.44 18.88%–73.33% > 49.06 88.89 56.50%–99.43% 55.56 26.67%–81.12% > 53.95 88.89 56.50%–99.43% 66.67 35.42%–87.94% > 58.57 88.89 56.50%–99.43% 77.78 45.26%–96.05% > 61.85 88.89 56.50%–99.43% 88.89 56.50%–99.43% > 64.45 77.78 45.26%–96.05% 88.89 56.50%–99.43% > 68.21 77.78 45.26%–96.05% 100 70.09%–100.0% > 72.82 66.67 35.42%–87.94% 100 70.09%–100.0% > 77.32 55.56 26.67%–81.12% 100 70.09%–100.0% > 95.59 44.44 18.88%–73.33% 100 70.09%–100.0% > 140.6 33.33 12.06%–64.58% 100 70.09%–100.0% > 220.4 22.22 3.948%–54.74% 100 70.09%–100.0% > 319.4 11.11 0.5699%–43.50% 100 70.09%–100.0% Abbreviations: CI, Confidence interval.
