Table 4.
Number of valid samples filtered by different smartphone PPG quality index (SPQI) levels.
| Threshold | FPDT | rMSSD | pNN50 | SDNN | log HF | log LF | Avg. (FPDT) | Avg. (SPQI) |
|---|---|---|---|---|---|---|---|---|
| SPQI > 0 | Peak | 1283 | 1331 | 1276 | 1226 | 1257 | 1274.6 | 1263 |
| Valley | 1258 | 1329 | 1269 | 1245 | 1255 | 1271.2 | ||
| M1D | 1233 | 1330 | 1276 | 1250 | 1262 | 1270.2 | ||
| M2D | 1227 | 1321 | 1204 | 1189 | 1223 | 1232.8 | ||
| Tangent | 1250 | 1325 | 1274 | 1236 | 1246 | 1266.2 | ||
| SPQI > 0.8 | Peak | 1067 | 1087 | 1075 | 1049 | 1071 | 1069.8 | 1060 |
| Valley | 1062 | 1083 | 1073 | 1056 | 1066 | 1068.0 | ||
| M1D | 1052 | 1085 | 1067 | 1054 | 1068 | 1065.2 | ||
| M2D | 1006 | 1078 | 1012 | 1032 | 1057 | 1037.0 | ||
| Tangent | 1046 | 1081 | 1065 | 1053 | 1064 | 1061.8 | ||
| SPQI > 0.95 | Peak | 565 | 550 | 566 | 558 | 565 | 560.8 | 557 |
| Valley | 563 | 548 | 567 | 562 | 562 | 560.4 | ||
| M1D | 561 | 545 | 564 | 555 | 560 | 557.0 | ||
| M2D | 542 | 546 | 553 | 548 | 560 | 549.8 | ||
| Tangent | 562 | 548 | 564 | 557 | 563 | 558.8 |