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Table 3 Agreement between NDDS and composite indicators of delay for children over 3 (Group B; n = 211)

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 107 143 97 130 116 162 114 158
False negative 13 25 23 38 4 6 6 10
False positive 64 28 57 24 83 37 80 36
True positive 27 15 34 19 8 6 11 7
Sensitivity (%) (95 % CI) 68 (51–81) 38 (23–54) 60 (46–72) 33 (21–47) 67 (35–90) 50 (21–79) 65 (38–86) 41 (18–67)
Specificity (%) (95 % CI) 63 (70–55) 84 (89–77) 63 (71–55) 84 (90–78) 58 (65–51) 81 (87–75) 59 (66–51) 81 (87–75)
PPV (%) (95 % CI) 30 (21–40) 35 (21–51) 37 (27–48) 44 (29–60) 9 (4–17) 14 (5–28) 12 (6–21) 16 (7–31)
NPV (%) (95 % CI) 89 (94–82) 85 (90–79) 81 (87–73) 77 (83–70) 97 (99–92) 96 (99–92) 95 (98–89) 94 (97–89)