Table 2.
Criterion response parameter estimates from final model, with 95% confidence intervals
| No DUI | DUI | ||||
|---|---|---|---|---|---|
| Discrimination | Difficulty | Discrimination | Difficulty | Effect Size | |
| Role failure | 2.41 (1.78–3.05) | 4.76 (4.18–5.34) | 2.41 (1.78–3.05) | 4.76 (4.18–5.34) | NO DCF |
| Social/interpersonal problems A, B | |||||
| Male | 1.87 (1.37–2.38) | 2.10 (1.65–2.54) | 2.36 (1.56–3.15) | 2.46 (1.52–3.39) | .36 |
| Female | 2.05 (1.40–2.69) | 2.81 (2.37–3.25) | 2.36 (1.56–3.15) | 2.46 (1.52–3.39) | .35 |
| Tolerance | 1.05 (0.77–1.32) | 1.18 (1.01–1.35) | 1.05 (0.77–1.32) | 1.18 (1.01–1.35) | NO DCF |
| Withdrawal | 2.03 (1.54–2.52) | 5.68 (5.13–6.23) | 2.03 (1.54–2.52) | 5.68 (5.13–6.23) | NO DCF |
| Larger/longer A, B | |||||
| Male | 1.25 (0.91–1.59) | 0.45 (0.18–0.71) | 1.55 (1.14–1.95) | 0.68 (0.00–1.36) | .23 |
| Female | 1.15 (0.81–1.49) | 0.18 (0.00–0.36) | 1.55 (1.14–1.95) | 0.68 (0.00–1.36) | .50 |
| Inability/persistent desire to quit A | 1.19 (0.87–1.52) | 1.13 (0.94–1.33) | 1.54 (1.10–1.99) | 1.69 (1.03–2.35) | .56 |
| Time spent drinking/recovering B | |||||
| Male | 1.48 (1.15–1.81) | 4.80 (4.28–5.32) | 1.48 (1.15–1.81) | 4.80 (4.28–5.32) | |
| Female | 1.76 (1.24–2.27) | 5.26 (4.61–5.91) | 1.76 (1.24–2.27) | 5.26 (4.61–5.91) | M:F .46 |
| Activities given up | 2.27 (1.69–2.85) | 5.58 (5.00–6.16) | 2.27 (1.69–2.85) | 5.58 (5.00–6.16) | NO DCF |
| Physical/psychological problems B | |||||
| Male | 1.88 (1.40–2.35) | 4.21 (3.68–4.73) | 1.88 (1.40–2.35) | 4.21 (3.68–4.73) | |
| Female | 1.99 (1.40–2.59) | 4.19 (3.65–4.72) | 1.99 (1.40–2.59) | 4.19 (3.65–4.72) | M:F .02 |
NOTE: letter superscripts indicate group differences by DUI status and/or gender,
A
parameters vary by DUI status;
B
parameters vary by gender.
NO DCF = no evidence of DCF (see Table 1) and so IRT parameters were constrained across groups. Effect size compares difficulty parameters across rows unless noted by M:F (denotes male-to-female comparison)