Table 4.
Items, Rates of Past 12-Month Endorsement, Item Response Model Severity Estimates, and Differential Item Functioning by Age
| Wave 1 |
Wave 3 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 12–14 years |
15–18 years |
18–20 years |
21–24 years |
|||||||
| Item content (least to most severe) | % (n = 2,030) | EST (nm = 402) | % (n = 4323) | EST (nm = 1,925) | DIF | % (n = 1,627) | EST (nm = 1,012) | % (n = 3,134) | EST (nm = 2,082) | DIF |
| 12 or more drinks | 14.1 | –2.46 | 35.0 | –2.69 | 0.23 | 55.0 | –3.90 | 60.8 | –4.35 | 0.45 |
| Gotten drunk | 12.2 | –1.93 | 34.0 | –2.53 | 0.60* | 50.7 | –3.11 | 50.5 | –2.72 | –0.39 |
| 5 drinks in a row | 12.3 | –1.95 | 31.8 | –2.19 | 0.24 | 46.8 | –2.58 | 49.5 | –2.58 | 0.00 |
| Hung over | 9.0 | –1.02 | 22.4 | –0.94 | –0.08 | 39.2 | –1.70 | 42.8 | –1.89 | 0.19 |
| Threw up | 7.1 | –0.51 | 22.3 | –0.94 | 0.43 | 34.3 | –1.20 | 34.0 | –1.01 | –0.19 |
| Monthly | 7.9 | –0.72 | 21.6 | –0.85 | 0.13 | 38.5 | –1.61 | 47.8 | –2.36 | 0.75* |
| Regretted action | 4.9 | 0.19 | 11.0 | 0.55 | –0.36 | – | – | – | – | – |
| Weekly | 3.7 | 0.62 | 12.0 | 0.41 | 0.21 | 23.4 | –0.11 | 31.3 | –0.73 | 0.62* |
| Parent problem | 6.0 | –0.18 | 17.2 | –0.31 | 0.13 | – | – | – | – | – |
| Date problem | 3.4 | 0.76 | 10.8 | 0.59 | 0.17 | 10.6 | 1.38 | 9.8 | 1.63 | –0.25 |
| Regret sexual situation | 2.7 | 1.1 | 10.3 | 0.66 | 0.44 | 15.5 | 0.74 | 13.9 | 1.05 | –0.31 |
| Physical fight | 3.1 | 0.89 | 7.4 | 1.17 | –0.28 | 7.2 | 1.96 | 7.4 | 2.07 | –0.11 |
| Friend problem | 3.0 | 0.96 | 7.4 | 1.18 | –0.22 | 8.2 | 1.76 | 8.0 | 1.95 | –0.19 |
| School problem | 2.1 | 1.41 | 3.4 | 2.23 | –0.82* | 5.2 | 2.40 | 5.6 | 2.46 | –0.06 |
| Drunk at school or work | – | – | – | – | – | 6.2 | 2.17 | 4.1 | 2.86 | –0.69* |
| Daily | 0.6 | 2.84 | 1.0 | 3.66 | –0.82 | 1.7 | 3.79 | 2.2 | 3.63 | 0.16 |
EST, Rasch model severity estimate; DIF, differential item functioning; nm, number of participants with at least one but not all symptoms, who thereby are included in the Rasch model.
*
DIF that was statistically significant at the 0.05 level and above a moderate effect size cut-off point of 0.50.