Table 3 Psychometric properties

Acceptability

 % missing (summary score)

2.73%

Skewness

Shapiro-Wilk

<0.05

Skewness test

0.056

Shapiro-Francia

<0.05

Reliability

 Internal consistency (alpha)

0.73

Validity

Convergent (Spearman rho)

 MMSE

0.059

0.55

 Disability

-0.08

0.40

Discriminant

 Age

-0.048

0.62

Known groups

 Sex (z)

1.958

0.05

 Education (z)

0.751

0.45

 Marital status (χ²)

2.989

0.39

 Self perceived health (z)

-2.428

0.02

Factor analysis

1 factor solution

22% variance