Table 3.

P/N ratios calculated from three S-based ELISAs applied to 21 patient samples.

PT No.	S-cell-base ELISA	S1-protein-based ELISA kit	RBD-protein-based ELISA kit
1	7.428 ± 0.292	2.497 ± 0.174	7.089 ± 0.305
2	9.052 ± 0.222	3.947 ± 0.630	7.744 ± 1.119
3	7.547 ± 0.395	3.510 ± 0.214	8.481 ± 1.462
4	6.805 ± 0.303	4.460 ± 0.139	11.406 ± 0.834
5	8.944 ± 0.296	5.747 ± 0.243	13.755 ± 0.687
6	7.818 ± 0.153	4.624 ± 0.696	11.021 ± 1.095
7	6.424 ± 0.339	6.343 ± 0.141	14.704 ± 0.402
8	9.249 ± 0.289	6.836 ± 0.138	15.048 ± 0.194
9	6.606 ± 0.116	5.270 ± 0.438	14.064 ± 0.297
10	8.745 ± 0.502	6.198 ± 0.386	14.989 ± 0.059
11	5.794 ± 0.211	6.312 ± 0.183	8.202 ± 0.485
12	14.488 ± 0.139	6.400 ± 0.479	12.880 ± 0.723
13	10.354 ± 0.981	2.078 ± 0.209	2.535 ± 0.447
14	10.566 ± 0.146	3.646 ± 0.340	6.283 ± 0.629
15	9.768 ± 0.100	2.866 ± 0.177	3.820 ± 0.392
16	12.159 ± 0.389	7.603 ± 0.043	12.033 ± 0.480
17	5.839 ± 1.537	2.822 ± 0.118	8.174 ± 0.523
18	8.290 ± 0.354	2.176 ± 0.030	4.967 ± 0.085
19	10.323 ± 0.220	3.577 ± 0.096	13.693 ± 0.406
20	12.329 ± 0.354	7.436 ± 0.144	14.779 ± 0.070
21	11.370 ± 0.536	7.157 ± 0.231	15.776 ± 0.389

P/N ratio value:

       0  4 8 12 16