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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.