Table 3.
Descriptive statistics, internal consistency reliability, precision, and inter-scale correlations.
| Positive Affect | Negative Affect | |
|---|---|---|
| Descriptive statistics | ||
| Potential Range | 0 to 16 | 0 to 16 |
| Observed Range – | 0 to 16 | 0 to 16 |
| Mean, SD | 12.26 (3.30) | 3.18 (3.13) |
| POMP, SD | 76.60 (20.60) | 19.90 (19.50) |
| Skew | –.88 | 1.23 |
| Kurtosis | –.34 | 1.23 |
| Standard Error of Measurement (SEm) | 1.19 | 1.57 |
| Standard Error of Difference (SEd) | 1.68 | 2.21 |
| Internal consistency reliability | ||
| Average inter-item r | .60 | .43 |
| Cronbach’s alpha | .86 | .75 |
| McDonald’s omega total | .87 | .75 |
| Clinical change benchmarks | ||
| 90% Critical Change | 2.78 | 3.65 |
| 95% Critical Change | 3.30 | 4.34 |
| Minimally Important Difference (MID) | 3.30 | 3.13 |
| Jacobson benchmark threshold (5% tail) | LB: 5.79 | UB: 9.31 |
| Scale correlations | ||
| SPARQ – Positive Affect | 1 | |
| SPARQ – Negative Affect | –.50*** | 1 |
LB, lower bound; POMP, percentage of maximum possible; UB, upper bound. MID was operationally defined as d, .5. *** p < .001, two-tailed.