Table 3.
Final multivariable linear regression model for SARS-CoV-2 antibodies titre
| Variable | Beta (95% CI) | P value |
| Gender (male) | −0.1100 (−0.1738 to −0.04617) | 0.0008 |
| Age | −0.005231 (−0.009047 to −0.001416) | 0.0073 |
| Smoking (yes) | −0.1097 (−0.1737 to −0.04567) | 0.0008 |
| 25(OH)D (Q3) | 0.07601 (−0.009362 to 0.1614) | 0.0809 |
| 25(OH)D (Q2) | 0.1231 (0.03724 to 0.2091) | 0.0050 |
| 25(OH)D (Q1) | 0.08248 (−0.003949 to 0.1689) | 0.0614 |
| Gender (male):age | −0.01090 (−0.01631 to −0.005490) | <0.0001 |
Adjusted R2=0.1355.
25(OH)D quartiles: Q4, 4.1–18.89; Q3, 18.9–25.67; Q2, 25.68–32.99; Q1, 33–69.8 ng/mL.
25(OH)D as categorical data Q1, Q2, Q3 compared with Q4 show p=0.0422.