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Table 4 Cutoff values of the probability for suspected low IQ*

From: Early life determinants of low IQ at age 6 in children from the 2004 Pelotas Birth Cohort: a predictive approach

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%
  1. *estimated from predictors in the final adjusted logistic regression model. Low IQ rate of 16.9% at age 6.
  2. The 2004 Pelotas Birth Cohort (n = 3312).