Table 2.
Sensitivity, Specificity, Predictive Values and Likelihood Ratios for the Clinic PSQ Food Insecurity Question Compared with the USDA Food Security Scale (FSS) (N = 205)a
| Food Insecurity Question | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | LR+ | LR− |
|---|---|---|---|---|---|---|
| ‘In the last year, did you worry that your food would run out before you got money or food stamps to buy more?’ | 59 | 87 | 70 | 81 | 4.5 | 0.47 |
a
Families were classified as food Insecure if the number of affirmative responses to the 18 items on the FSS > 2. The PSQ was completed by SEEK parents in the pediatric clinic. The FSS was completed by 205 SEEK parents in the laboratory within 2 weeks of completing the clinic PSQ.
LR− = Negative Likelihood Ratio; LR + = Positive Likelihood Ratio; NPV = Negative Pedictive Value; PPV = Positive Predictive Value.