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Table 2 The percentage of infants scoring at or below the Norwegian (N ref.) and US cut-off values at 4, 6 and 12 months

From: Prevalence of suspected developmental delays in early infancy: results from a regional population-based longitudinal study

     4 months    6 months    12 months
  N ref. US N ref. US N ref. US
  Cut-off Cut-off Cut-off Cut-off Cut-off Cut-off
Communication 1.4 % 1.4 % 0.6 % 0.6 % 0.7 % 2.5 %
Gross motor 2.6 % 2.6 % 2.3 % 5.9 % 3.6 % 8.7 %
Fine motor 1.9 % 4.6 % 1.8 % 1.8 % 0.4 % 0.4 %
Problem- solving 2.5 % 2.5 % 1.0 % 0.2 % 1.8 % 1.8 %
Personal- social 1.1 % 3.6 % 1.5 % 3.7 % 0.5 % 1.4 %
Scoring at or below at least one area 7.0 % 10.3 % 5.7 % 10.3 % 6.1 % 12.3 %
  1. Recommended cut-off scores in the US (Mean – 2 SD)and in the Norwegian manual (primarily based on the 2 percentile) in the areas of Ages and Stages Questionnaire, see Additional file 1