| Variables | Sample | Mean | Standard Deviation | Kurtosis | Skewness | In-between Range |
| Reliability* | 30 | 0.77 | 0.14 | 1.31 | -1.09 | 0.36-0.94 |
| Age | 30 | 5.37 | 0.78 | -0.81 | -0.18 | 3.8-6.5 |
| Measure Design | 30 | 1.46 | 1.38 | -0.45 | 0.74 | 0-4 |
| Number of Items | 30 | 26.9 | 15.5 | 0.41 | 0.97 | 4-64 |
| Publication Year | 30 | 1981 | 8.2 | -1.15 | 0.16 | 1972-1998 |