Fig. 3: Odds ratio with 95% confidence intervals from logistic regression comparing seronegative vs. seroconverting (Class 3 vs. Class 1) using demographic factors and individual symptoms that would be available without a positive test result.
From: Anti-spike antibody response to natural SARS-CoV-2 infection in the general population
a Using all data from Class 3 (N = 1742) vs. Class 1 (N = 4683). b Restricting Class 3 to those with Ct value ≤ 32 and ≥2 genes detected (N = 595) to decrease the impact of potential false-positive swab tests. Age was fitted using natural cubic spline with one internal knot placed at 50 years and two boundary knots at 20 and 80 years. Effect of age is presented in Supplementary Fig. 4. The 95% confidence intervals are calculated by prediction ± 1.96 × SE of the prediction; solid dots indicate estimates with p-values < 0.05, whereas hollow dots indicate those with p-values ≥ 0.05. Numbers of odds ratio, 95% CI and p-values are presented in Supplementary Table 3.
