Table 5.
Comparison among titer dilution values of anti-RBD IgG, anti-S1 IgG, and anti-S2 IgG, stratified according to positive and negative levels of anti-N IgG.
| Anti-N IgG | Anti-RBD IgG | Anti-S1 IgG | Anti-S2 IgG | p-Value (Test) |
|---|---|---|---|---|
| Negative | p < 0.0001 * (KW) | |||
| Mean ± SD | 1432.6 ± 360.8 | 1242.3 ± 491.7 | 178.2 ± 190.9 | anti-S2 vs. anti-RBD, p < 0.05 * (Co) |
| Median (IRQ) | 1600 [1600, 1600] | 1600 [872.5, 1600] | 114 [82, 213] | anti-S2 vs. anti-S1, p < 0.05* (Co) |
| Mean rank | 433.4 | 355.2 | 40.3 | anti-S1 vs. anti-RBD, p < 0.05 * (Co) |
| Positive | p < 0.0001 * (KW) | |||
| Mean ± SD | 1582.2 ± 141.6 | 1575.7 ± 127.9 | 132.9 ± 73.7 | |
| Median (IRQ) | 1600 [1600, 1600] | 1600 [1600, 1600] | 133 [77.75, 180.5] | anti-S2 vs. anti-RBD, p < 0.05 * (Co) |
| Mean rank | 226.7 | 220.2 | 22.0 | anti-S2 vs. anti-S1, p < 0.05 * (Co) |
* = significant test; KW = Kruskal–Wallis test; Co = Conover post hoc test.