Table 7.
Distinguishing 14 MCI from 15 cognitively intact participants with characteristics reported in Table 6 using LIWC feature sets
| LIWC categories | Number of features | Sensitivity | Specificity | Accuracy | AUC-ROC |
|---|---|---|---|---|---|
| Chance | 68 | 57.31 | 46.46 | 51.47 | 51.89 |
| All categories | 68 | 77.55 | 47.23 | 61.81 | 62.39† |
| Linguistic dimensions | 17 | 59.85 | 55.13 | 65.28 | 57.49 |
| Psychological processes | 25 | 69.93 | 37.0 | 52.73 | 53.46 |
| Relativity | 10 | 74.23 | 78.70 | 76.42 | 76.46† |
| Personal concerns | 19 | 65.21 | 51.83 | 58.11 | 58.52 |
| Spoken categories | 3 | 47.8 | 51.7 | 44.45 | 49.75 |
Abbreviations: MCI, mild cognitive impairment; LIWC, Linguistic Inquiry and Word Count; AUC-ROC, area under the curve of receiver operating characteristics (best result indicated in bold).
NOTE. †P < .05.