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Table 4 Associations between average of the three seasons of moderate-to-vigorous physical activity, sedentary time, sleep duration and cardio-respiratory fitness with potential explaining variables in 8–11 year old Danish children

From: Seasonal variation in objectively measured physical activity, sedentary time, cardio-respiratory fitness and sleep duration among 8–11 year-old Danish children: a repeated-measures study

Variable1 n Moderate-to-vigorous physical activity (min/day) (n = 635) Sedentary time (min/day) (n = 635) Sleep duration (min/night) (n = 523) Cardio-respiratory fitness (ml/kg/min) (n = 492)
   B (95%CI) P B (95%CI) P B (95%CI) P B (95%CI) p
Age (years) 730 −2.7 (−4.5;-0.8) 0.0463 27.8 (21.5;34.1) <0.001 −10.2 (−13.4;-7.1) <0.001 0.8 (0.1;1.5) 0.03
Grade 730  
 3rd graders 359 Reference   Reference   Reference   Reference  
 4th graders 371 −5.4 (−8.7;-2.1) <0.001 32.4 (24.4;40.4) <0.001 −13.6 (−17.5;-9.6) <0.001 −0.1 (−1.0;0.8) 0.87
Pubertal status 706  
 1 464 Reference   Reference   Reference   Reference  
 ≥2 242 −7.5 (−11.0;-3.9) <0.001 12.0 (3.0;21.0) 0.01 −7.2 (−11.6;-2.9) 0.001 −2.5 (−3.4;-1.6) <0.001
Gender 730  
 Girls 354 Reference   Reference   Reference   Reference  
 Boys 376 19.9 (16.9;22.9) <0.001 −0.3 (−8.7;8.1) 0.95 −5.1 (−9.2;-1.0) 0.01 8.0 (7.5;8.5) <0.001
Parents born in Denmark2 730  
 0 79 Reference   Reference   Reference   Reference  
 1 89 2.3 (−4.8;9.4) 0.52 12.6 (−5.2;30.4) 0.16 20.8 (11.2;30.5) <0.001 1.3 (−0.7;3.2) 0.20
 2 562 −2.4 (−8.0;3.2) 0.40 13.5 (−0.4;27.4) 0.064 19.2 (11.1;30.5) <0.001 0.1 (−1.5;1.7) 0.89
Highest education of parents2 728  
 ≤10 years 38 Reference   Reference   Reference   Reference  
 11 - 12 years 228 −3.1 (−11.6;5.3) 0.46 13.0 (−7.9;34.0) 0.22 24.4 (12.9;35.9) <0.001 0.8 (−1.3;3.0) 0.45
 13 - 16 years 295 −4.0 (−12.2;4.3) 0.35 22.5 (1.9;43.1) 0.03 26.0 (14.7;37.4) <0.001 1.1 (−1.1;3.3) 0.31
 ≥17 years 167 −1.3 (−9.9;7.2) 0.76 24.0 (2.7;45.3) 0.03 23.0 (11.4;34.6) <0.001 1.5 (−0.7;3.7) 0.20
  1. 1All dependent variables are from the baseline assessments.
  2. 2P > 0.05 between non-reference groups.
  3. 3B = −2.4 (95%CI = −5.8;1.0, P = 0.17) among children with a valid cardio-respiratory fitness test (n = 413).
  4. 4B = 16.6 (95%CI = 3.4;29.9, P = 0.01) if wear-time was included as covariate.