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Cutoff values of the probability for suspected low IQ*
| Test properties | Cutoff value | |
|---|---|---|
| ≥0.17 | ≥0.20 | |
| Sensitivity | 72.0% | 66.5% |
| Specificity | 73.6% | 78.6% |
| Positive predictive value | 35.0% | 38.1% |
| Negative predictive value | 93.0% | 92.2% |
| Percentage of positives in the cohort | 34.0% | 28.9% |
| Correctly classified | 73.3% | 76.6% |
*estimated from predictors in the final adjusted logistic regression model. Low IQ rate of 16.9% at age 6.
The 2004 Pelotas Birth Cohort (n = 3312).
