Table 2.
Reliability for the impairment items and item drop of the ADHD Rating Scale—5.
| Item | N | Cronbach’s α | McDonald’s ω | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Raw | Std | Lower | Upper | G6 | Mr | Hierarch. | Total | ||
| Drop: teacher relations | 3,742 | 0.85 | 0.85 | – | – | 0.83 | 0.51 | – | – |
| Drop: peer relations | 3,742 | 0.84 | 0.84 | – | – | 0.83 | 0.50 | – | – |
| Drop: academic functioning | 3,742 | 0.84 | 0.84 | – | – | 0.81 | 0.50 | – | – |
| Drop: behavioral funct. | 3,742 | 0.84 | 0.84 | – | – | 0.82 | 0.50 | – | – |
| Drop: homework funct. | 3,741 | 0.84 | 0.84 | – | – | 0.83 | 0.50 | – | – |
| Drop: self-esteem | 3,742 | 0.85 | 0.85 | – | – | 0.84 | 0.50 | – | – |
| After Inatt. rating | 3,742 | 0.87 | 0.87 | 0.86 | 0.87 | 0.86 | 0.50 | 0.78 | 0.91 |
| Drop: teacher relations | 3,742 | 0.86 | 0.86 | – | – | 0.85 | 0.52 | – | – |
| Drop: peer relations | 3,742 | 0.85 | 0.85 | – | – | 0.84 | 0.50 | – | – |
| Drop: academic functioning | 3,741 | 0.84 | 0.85 | – | – | 0.83 | 0.52 | – | – |
| Drop: behavioral funct. | 3,742 | 0.84 | 0.85 | – | – | 0.83 | 0.51 | – | – |
| Drop: homework funct. | 3,742 | 0.85 | 0.85 | – | – | 0.84 | 0.51 | – | – |
| After Hyp.-Imp. rating | 3,742 | 0.87 | 0.87 | 0.86 | 0.88 | 0.87 | 0.51 | 0.76 | 0.92 |
Analyses done for Inatt. and Hyp.-Imp. separately; A = Inatt., H = Hyp.-Imp.; N varies due to missing/false values; reliability for Inatt. and Hyp.-Imp.; lower and upper α for 95% confidence boundaries; G6 = Guttman’s 6; Mr = mean intercorrelation; results for items: if dropped.