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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).
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BMC Pediatrics

ISSN: 1471-2431

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