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Table 4 The day-to-day analysis of sleep and physical activity within individuals

From: Sleep, physical activity and BMI in six to ten-year-old children measured by accelerometry: a cross-sectional study

Dependent variable

Predicting covariate

Coef.a

95% CI

A. Physical Activity

   

Total activity (cpm)

Sleep efficiency

0.005

-0.019 to 0.028

 

Total Sleep time

-0.001

-0.024 to 0.022

 

Sleep end

-0.059

-0.087 to -0.031

 

Sleep start

-0.046

-0.074 to -0.017

MVPA (minutes)

Sleep efficiency

<0.001

-0.023 to 0.025

 

Total sleep time

0.008

-0.0156 to 0.032

 

Sleep end

-0.050

-0.078 to -0.022

 

Sleep start

-0.048

-0.077 to -0.020

Sedentary (%)

Sleep efficiency

-0.004

-0.029 to 0.020

 

Total sleep time

0.004

-0.020 to 0.027

 

Sleep end

0.055

0.027 to 0.083

 

Sleep start

0.039

0.009 to 0.067

B. Sleep

   

Sleep efficiency (%)

MVPA

0.024

<0.001 to 0.047

 

Sedentary

-0.038

-0.061 to -0.014

 

Total activity

0.024

<0.001 to 0.048

Sleep onset (hour)

MVPA

0.082

0.059 to 0.105

 

Sedentary

-0.108

-0.131 to -0.085

 

Total activity

0.099

0.077 to 0.126

Sleep end (hour)

MVPA

0.080

0.057 to 0.103

 

Sedentary

-0.115

-0.138 to -0.093

 

Total activity

0.094

0.071 to 0.116

Total sleep time (minutes)

MVPA

0.020

-0.003 to 0.043

 

Sedentary

-0.003

-0.026 to 0.021

 

Total activity

0.016

-0.007 to 0.039

  1. aValues are standardized coefficients and their 95% confidence interval, CI. Values are controlled for gender, age, weekend/weekday and all interactions. Upper part (A) showing the effect of sleep on the following day’s activity. Lower part (B showing the effect of activity on the following night’s sleep. Variables with a confidence interval, CI, not including “zero” are in bold text. Abbreviations: cpm counts per minute, MVPA  percent of the recorded time spent in MVPA, Sedentary percent of the recorded time spent in sedentary activity, Total activity mean activity (cpm), n 1,160 individuals and 7,164 observations of sleep data.