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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