Table 7.
DIF for the 11 mYFAS2 diagnostic criteria
| Diagnostic criteria | t value | P value | DIF contrast* |
|---|---|---|---|
| Gender DIF | |||
| Substance taken in larger amount and for longer period than intended | − 0.37 | 0.71 | − 0.11 |
| Persistent desire or repeated unsuccessful attempts to quit | − 2.18 | 0.03 | − 0.69 |
| Much time/activity to obtain, use, recover | − 0.06 | 0.95 | − 0.02 |
| Important social, occupational, or recreational activities given up or reduced | 3.77 | < 0.01 | 0.94 |
| Use continues despite knowledge of adverse consequences (e.g., emotional problems, physical problems) | − 0.89 | 0.38 | − 0.25 |
| Tolerance (marked increase in amount; marked decrease in effect) | 0.17 | 0.87 | 0.06 |
| Characteristic withdrawal symptoms; substance taken to relieve withdrawal | − 2.69 | 0.01 | − 0.73 |
| Continued use despite social or interpersonal problems | − 1.06 | 0.29 | − 0.26 |
| Failure to fulfill major role obligation (e.g., work, school, home) | 3.41 | < 0.01 | 0.83 |
| Use in physically hazardous situations | − 0.26 | 0.79 | − 0.06 |
| Craving, or a strong desire or urge to use | − 0.87 | 0.39 | − 0.26 |
| BMI DIF | |||
| Substance taken in larger amount and for longer period than intended | 0.40 | 0.69 | 0.13 |
| Persistent desire or repeated unsuccessful attempts to quit | 0.91 | 0.36 | 0.31 |
| Much time/activity to obtain, use, recover | − 1.76 | 0.07 | − 0.66 |
| Important social, occupational, or recreational activities given up or reduced | − 1.41 | 0.16 | − 0.37 |
| Use continues despite knowledge of adverse consequences (e.g., emotional problems, physical problems) | 0.62 | 0.53 | 0.19 |
| Tolerance (marked increase in amount; marked decrease in effect) | − 1.51 | 0.13 | − 0.55 |
| Characteristic withdrawal symptoms; substance taken to relieve withdrawal | 0.15 | 0.88 | 0.04 |
| Continued use despite social or interpersonal problems | − 0.38 | 0.70 | − 0.10 |
| Failure to fulfill major role obligation (e.g., work, school, home) | 0.08 | 0.93 | 0.02 |
| Use in physically hazardous situations | 1.61 | 0.11 | 0.42 |
| Craving, or a strong desire or urge to use | 0.71 | 0.48 | 0.23 |
DIF differential item functioning
No substantial DIF was found in mYFAS 2.0
*Positive values indicate that the probability of the item endorsement is easier for male participants than female participants; easier for participants with BMI < 24 than those with BMI ≥ 24