Table 3.
. Symptom pattern in relation to antibody seropositivity. Any symptom indicates participant's response to the App including whether they had symptoms they thought were COVID before the App was launched. Anosmia was reported prospectively only.
| Symptoms | Serology+ - | Sensitivity% (95%CI) | Specificity% (95%CI) | PPV% (95%CI) | NPV% (95%CI) | ||
|---|---|---|---|---|---|---|---|
| Any App symptoms | + | 39 | 144 | 81(67–91) | 57 (52–62) | 21 (18–24) | 96 (93–98) |
| – | 9 | 190 | |||||
| Any core symptoms | + | 35 | 50 | 73 (60–85) | 85 (81–89) | 40 (34–47) | 96 (94–97) |
| – | 13 | 284 | |||||
| Anosmia alone | + | 23 | 18 | 48 (35–63) | 95 (92–97) | 56 (44–68) | 93 (91–95) |
| – | 25 | 319 | |||||
| Predicted COVID using algorithm | + | 18 | 16 | 37 (26–53) | 95 (93–97) | 53 (39–66) | 92 (90–93) |
| – | 30 | 321 | |||||