Item difficulties and item thresholds per subscale, three response options
| Difficulty | Threshold 1 | Threshold 2 | |
| Consistency of interests | |||
| Item 1 | 1.36 | 0.50 | 2.21 |
| Item 3 | 0.10 | −0.85 | 1.04 |
| Item 5 | −0.13 | −1.09 | 0.83 |
| Item 7 | 0.60 | −0.12 | 1.32 |
| Item 9 | −0.40 | −1.49 | 0.69 |
| Perseverance of effort | |||
| Item 2 | 0.39 | −0.89 | 1.67 |
| Item 4 | −0.28 | −1.89 | 1.33 |
| Item 6 | 0.52 | −0.87 | 1.91 |
| Item 8 | 0.62 | −1.06 | 2.30 |
| Item 10 | 1.25 | −0.30 | 2.79 |
Thresholds represent the location on the logit scale of the latent dimension were each adjacent response category becomes the highest probability to solve—or to be chosen. Item difficulties are the average threshold, which also can be seen in the person-item maps (Figure 3A,B).