Table 8.
Partial correlations among digital biomarker features in upper grades.
| HR | HF | LF | LF/HF | RMSSD | SDNN | pNN50 | Happy. TF:time | Neutral. TF:time | Sad. TF:time | Contempt.TF:time | Pitch_ mean | Jitter | Shimmer | Loudness_mean | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| K-CDI-2 | -.160 | -.351 | .499* | .499** | -.159 | -.025 | -.291 | -.008 | -.070 | -.157 | -.096 | -.082 | .396 | .126 | -.235 |
| K-RCMAS-2 | -.294 | -.431* | .443* | .529* | -.203 | -.018 | -.262 | .141 | -.143 | -.203 | -.027 | .091 | .314 | -.020 | -.229 |
| Stress | -.141 | -.326 | .319 | .489* | -.4118 | -.027 | -.523* | .342 | .006 | -.017 | .274 | -.009 | .235 | -.157 | -.113 |
Controlling for gender as covariates. K-CDI-2: Korean Version Children Depression Inventory 2nd Edition; K-RCMAS-2, The Revised Children’s Manifest Anxiety Scale Korean Version 2nd Edition; Stress, Stress Scale; HR, Heart Rate; HF, High-Frequency Power; LF, Low-Frequency Power; LF/HF, Ratio of Low-Frequency to High-Frequency; RMSSD, Root Mean Square of the Successive Difference; SDNN, Standard Deviation of Normal to Normal Interval; pNN50, The proportion of NN50 divided by the total number of NN (R-R) intervals; Happy.TF:time, The total duration of gazing at happy facial expressions; Neutral.TF:time, The total duration of gazing at neutral facial expressions; Sad.TF:time, The total duration of gazing at sad facial expressions; Contempt.TF:time, The total duration of gazing at contemptuous facial expressions.
*p <.05, **p <.01.