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Table 6 Growth model parameter estimates of predictors for trajectories in cognitive abilities, as measured with the Mini Mental State Examination (MMSE) (n = 64)

From: Preliminary evidence for an increased likelihood of a stable trajectory in mild cognitive impairment in individuals with higher motivational abilities

Variable

MMSE

Fixed effects

Random effects

Estimate (s.e.)

df

t

p

Variance

Co-Variance

Intercept

26.11 (0.71)

63.73

26.80

0.001

1.26

−0.45 a

Time (years)

− 0.82 (0.25)

54.74

−3.29

0.002

2.96

−0.45 a

Motivational abilities b

0.56 (0.25)

60.90

2.23

0.030

  

Age

−0.11 (0.23)

64.39

−0.49

0.623

  

Sex (0 = male, 1 = female)

0.76 (0.48)

61.83

1.58

0.120

  

Executive function c

− 0.62 (0.22)

60.85

−2.78

0.007

  

Education (years)

0.08 (0.24)

62.15

0.32

0.751

  

MCI subtype (0 = amnestic, 1 = non-amnestic)

0.16 (0.47)

62.92

0.35

0.731

  

Residual

    

2.57

 

AIC = 1047.86

      
  1. The bold values indicate a statistically significant correlation with a p-value less than 0.05
  2. AIC Akaike information criterion, df degrees of freedom, MMSE Mini-Mental State Examination, p probability, s.e. standard error, t independent t-test
  3. a Covariance of the Intercept and Time random effects
  4. b Composite measure including informant-rated motivational abilities at baseline (t1)
  5. c Interference score of the Stroop Color-Word Test