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Table 2 Agreement between NDDS and BSID-III-based indicators of delay for children aged 3 and under (Group A; n = 594)

From: Evaluation of the revised Nipissing District Developmental Screening (NDDS) tool for use in general population samples of infants and children

  Mild delay Severe delay
  Published norms Distribution-based cut-points Published norms Distribution-based cut-points
  1+ 2+ 1+ 2+ 1+ 2+ 1+ 2+
True negative 328 423 283 368 364 485 352 467
False negative 42 70 87 125 6 8 18 26
False positive 162 67 136 51 212 91 197 82
True positive 61 33 88 50 11 9 27 19
Sensitivity (%) (95 % CI) 59 (49–69) 32 (23–42) 50 (43–58) 29 (22–36) 65 (38–86) 53 (28–77) 60 (44–74) 42 (28–58)
Specificity (%) (95 % CI) 67 (62–71) 86 (83–89) 68 (63–72) 88 (84–91) 63 (59–67) 84 (81–87) 64 (60–68) 85 (82–88)
PPV (%) (95 % CI) 27 (22–34) 33 (24–43) 39 (33–46) 50 (39–60) 5 (2–9) 9 (4–16) 12 (8–17) 19 (12–28)
NPV (%) (95 % CI) 89 (85–92) 86 (82–89) 76 (72–81) 75 (71–78) 98 (97–99) 98 (97–99) 95 (92–97) 95 (92–97)
  1. Note: PPV Positive Predictive Value, NPV Negative Predictive Value