Table 3.
3PL IRT pseudo-guessing parameters for all OGD-Q items.
| Item | Component | α | c1 | c2 | c3 | c4 | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Tolerance | 2.93 | (0.35) | –2.64 | (0.21) | –5.27 | (0.32) | –6.35 | (0.38) | –8.50 | (0.59) |
| 2 | Withdrawal | 4.71 | (0.67) | –6.18 | (0.55) | –8.55 | (0.69) | –10.28 | (0.81) | –12.08 | (0.98) |
| 3 | Intrapsychic Conflict | 4.33 | (0.61) | –5.32 | (0.44) | –7.55 | (0.56) | –9.44 | (0.67) | –11.79 | (0.91) |
| 4 | Interpersonal | 4.00 | (0.58) | –4.93 | (0.41) | –6.73 | (0.50) | –8.41 | (0.60) | –10.79 | (0.81) |
| 5 | Salience | 3.20 | (0.44) | –2.80 | (0.23) | –5.13 | (0.33) | –6.72 | (0.41) | –8.92 | (0.61) |
| 6 | Mood Modification | 4.03 | (0.69) | –4.89 | (0.47) | –6.77 | (0.58) | –8.09 | (0.66) | –12.16 | (1.28) |
| 7 | Intrapsychic Conflict | 4.29 | (0.79) | –5.32 | (0.57) | –7.54 | (0.72) | –9.14 | (0.84) | –10.62 | (0.96) |
| 8 | Gambling through behaviours | 2.88 | (0.38) | –2.17 | (0.19) | –4.37 | (0.28) | –5.99 | (0.35) | –7.46 | (0.46) |
| 9 | Deception | 4.88 | (0.86) | –6.21 | (0.66) | –8.32 | (0.79) | –10.36 | (0.95) | –12.20 | (1.11) |
| 10 | Borrowing due to gambling | 4.66 | (1.12) | –7.50 | (1.12) | –9.22 | (1.29) | –10.50 | (1.44) | –11.98 | (1.61) |
| 11 | Salience | 6.31 | (1.15) | –8.93 | (1.03) | –11.63 | (1.26) | –13.74 | (1.45) | –15.50 | (1.61) |
Note: Standard errors are in parentheses. α = item discrimination, i.e., the ability of an item to discriminate between varying levels of the underlying trait (θ), problem gambling behaviour. c = pseudo-guessing parameter, i.e., decreasing probability of response based on lower latent trait level.