Table 5.
Comparison of performance using linguistic features extracted from five LIWC main groups of word categories, for distinguishing MCI subjects
| LIWC categories | Number of features | Sensitivity | Specificity | Accuracy | AUC-ROC |
|---|---|---|---|---|---|
| Linguistic dimensions | 17 | 64.37 | 55.43 | 69.0 | 62.2 |
| Chance | 17 | 30.7 | 76.3 | 60.9 | 53.5 |
| Psychological processes | 25 | 63.93 | 67.8 | 62.12 | 64.96† |
| Chance | 25 | 32.1 | 76.9 | 61.8 | 54.5 |
| Relativity | 10 | 80.77 | 75.83 | 83.33 | 79.61† |
| Chance | 10 | 30.6 | 76.2 | 60.9 | 53.4 |
| Personal concerns | 19 | 70.3 | 62.60 | 74.60 | 68.30† |
| Chance | 19 | 30.1 | 76.1 | 60.7 | 53.1 |
| Spoken categories | 3 | 43.45 | 67.23 | 59.11 | 55.34 |
| Chance | 3 | 30.7 | 76.3 | 60.9 | 53.5 |
Abbreviations: LIWC, Linguistic Inquiry and Word Count; MCI, mild cognitive impairment; AUC-ROC, area under the curve of receiver operating characteristics (best result indicated in bold).
NOTE. †P < .05.