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. 2013 Sep 8;13:808. doi: 10.1186/1471-2458-13-808

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

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

1All dependent variables are from the baseline assessments.

2P > 0.05 between non-reference groups.

3B = −2.4 (95%CI = −5.8;1.0, P = 0.17) among children with a valid cardio-respiratory fitness test (n = 413).

4B = 16.6 (95%CI = 3.4;29.9, P = 0.01) if wear-time was included as covariate.