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Table 2 Pairwise correlations between continuous covariates, predictors, and outcome variables

From: Cross-sectional associations between 24-hour time-use composition, grey matter volume and cognitive function in healthy older adults

 

Sex

Education (years)

LPA (min)

MVPA (min)

SB (min)

Sleep (min)

Total GM vol

Temporal vol

Hippocamp. vol

Ventricle vol

Frontal lobe vol

Processing speed

Executive function

Long-term memory

Age (years)

-0.10

(-0.20,-0.00)

0.01

(-0.09, 0.11)

0.05

(-0.05, 0.15)

-0.08

(-0.18, 0.02)

-0.00

(-0.11, 0.10)

0.03

(-0.07, 0.14)

-0.28

(-0.37, -0.19)

-0.20

(-0.29, -0.10)

-0.16

(-0.25, -0.06)

0.21

(0.11, 0.30)

-0.10

(-0.20, 0.00)

-0.14

(-0.24, -0.04)

-0.26

(-0.35, -0.16)

-0.07

(-0.25, 0.03)

Sex

 

-0.07

(-0.17, 0.03)

0.03

(-0.07, 0.13)

-0.20

(-0.30, -0.10)

0.00

(-0.10, 0.10)

0.14

(0.04, 0.23)

0.02

(-0.08, 0.12)

-0.01

(-0.11, 0.09)

-0.08

(-0.18, 0.02)

-0.01

(0.11, 0.09)

0.12

(0.02, 0.22)

0.01

(-0.10, 0.10)

-0.17

(-0.27, -0.07)

0.06

(-0.04, 0.16)

Education (years)

  

-0.05

(-0.15, 0.05)

-0.01

(-0.11, 0.09)

0.09

(-0.01, 0.19)

-0.10

(-0.20, 0.00)

0.05

(-0.05, 0.15)

0.03

(-0.07, 0.13)

0.02

(-0.08, 0.12)

-0.03

(-0.13, 0.08)

0.02

(-0.08, 0.12)

-0.01

(-0.12, 0.09)

0.12

(0.02, 0.22)

0.08

(-0.02, 0.19)

LPA (min)

   

0.29a

(0.19, 0.38)

0.06a

(-0.04, 0.16)

0.10a

(0.00, 0.19)

-0.04

(-0.14, 0.06)

-0.04

(-0.14, 0.06)

-0.00

(-0.10, 0.10)

0.02

(-0.07, 0.13)

-0.01

(-0.11, 0.09)

0.07

(-0.03, 0.18)

-0.05

(-0.15, 0.06)

0.02

(-0.09, 0.12)

MVPA (min)

    

-0.67a

(-0.73, -0.59)

-0.55a

(-0.63, -0.46)

0.04

(-0.06, 0.14)

0.05

(-0.05, 0.15)

0.06

(-0.04, 0.16)

-0.05

(-0.15, 0.05)

-0.07

(-0.17, 0.03)

0.18

(0.07, 0.27)

0.02

(-0.08, 0.12)

0.05

(-0.05, 0.15)

SB (min)

     

0.81a

(0.77, 0.85)

-0.02

(-0.12, 0.08)

-0.02

(-0.12, 0.08)

-0.00

(-0.10, 0.10)

0.01

(-0.09, 0.11)

0.07

(-0.03, 0.17)

-0.14

(-0.24, -0.04)

0.01

(-0.09, 0.12)

0.04

(-0.06, 0.14)

Sleep (min)

      

0.04

(-0.06, 0.14)

0.03

(-0.08, 0.13)

-0.04

(-0.14, 0.06)

0.00

(-0.10, 0.10)

-0.04

(-0.14, 0.06)

0.01

(-0.09, 0.12)

0.01

(-0.09, 0.11)

-0.12

(-0.23, -0.02)

Total GM vol

       

0.70

(0.65, 0.75)

0.19

(0.10, 0.29)

-0.24

(-0.33, -0.14)

0.67

(0.60, 0.72)

0.00

(-0.10, 0.11)

0.22

(0.12, 0.32)

0.07

(-0.04, 0.17)

Temporal vol

        

0.18

(0.08, 0.27)

-0.32

(-0.41, -0.23)

0.46

(0.38, 0.54)

0.01

(-0.10, 0.11)

0.14

(0.03, 0.24)

0.04

(-0.06, 0.15)

Hippocamp. vol

         

-0.21

(-0.30, -0.11)

0.05

(-0.05, 0.15)

0.06

(-0.06, 0.16)

0.12

(0.02, 0.22)

0.13

(0.03, 0.23)

Ventricle vol

          

-0.15

(-0.25, -0.05)

-0.06

(-0.17, 0.04)

-0.15

(-0.25, -0.05)

-0.09

(-0.19, 0.02)

Frontal lobe vol

           

-0.06

(-0.16, 0.05)

0.15

(0.04, 0.25)

0.10

(-0.00, 0.20)

Processing speed

            

0.01

(-0.09, 0.11)

0.07

(-0.04, 0.17)

Executive function

             

0.24

(0.13, 0.33)

  1. Note: Coefficients, unless stated otherwise, are Pearson correlation coefficients (with 95% confidence intervals using Fisher’s z-transformation) [53].a Denotes coefficients within the 24-hour time-use composition using pairwise symmetric balance coordinates (with non-parametric bootstrap 95% confidence intervals on 1000 bootstrap samples). LPA = light physical activity; MVPA = moderate-vigorous physical activity; SB = sedentary behaviour; vol = volume (ml); GM = grey matter; WMH = white matter hyperintensity. Correlations between sex (male = 0, female = 1) and other variables were explored using point biserial correlations, with positive correlations reflecting a positive relationship between female sex and the other variable. Bold denotes that p-value is statistically significant (p < 0.05)
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International Journal of Behavioral Nutrition and Physical Activity

ISSN: 1479-5868

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