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Table 1 Means and standard deviations for age for children who were all randomly assigned to one of two groups that either completed the standard book form first or the puzzle form first.

From: A puzzle form of a non-verbal intelligence test gives significantly higher performance measures in children with severe intellectual disability

Group

N

Age (years) (SD)

RCPM score (SD)

Total

76

8.6 (2.1)

25.6 (6.1)

Book form

38

8.7 (2.1)

25.5 (5.7)

Puzzle form

38

8.4 (2.1)

25.8 (6.7)