Table 4

Correlates of daily physical activity and sedentary time (adjusted means and 95% confidence intervals)
PAEE (kJ/kg/d)2 p-value Light PA (min/d) p-value Moderate PA (min/d) p-value Vigorous PA (min/d) p-value Sedentary time (min/d) p-value
Boys
  Ref: Weekday 90.5 (87.1 to 93.9) 575.3 (559.8 to 590.8) 52.7 (46.7 to 59.6) 5.0 (3.9 to 6.3) 308.2 (294.1 to 322.2)
  Saturday 77.8 (73.3 to 82.4) <0.001 484.2 (466.1 to 502.4) <0.001 31.6 (26.7 to 37.3) <0.001 2.7 (1.9 to 3.6) <0.001 372.4 (354.3 to 390.5) <0.001
  Sunday 74.2 (69.7 to 78.6) <0.001 468.2 (450.2 to 486.2) <0.001 21.4 (18.1 to 25.2)1 <0.001 2.4 (1.7 to 3.2) <0.001 375.0 (357.2 to 392.8) <0.001
Girls
  Ref: Weekday 69.1 (65.9 to 72.2) 533.0 (517.0 to 549.0) 28.0 (24.1 to 32.5) 0.9 (0.7 to 1.1) 384.5 (369.6 to 399.4)
  Saturday 70.3 (66.4 to 74.2) 0.517 510.3 (491.6 to 529.0) 0.005 16.0 (13.1 to 19.4) <0.001 0.8 (0.6 to 1.0) 0.329 362.2 (343.7 to 380.7) 0.014
  Sunday 55.4 (51.6 to 59.3)1 <0.001 444.4 (425.7 to 463.2)1 <0.001 9.2 (7.5 to 11.2)1 <0.001 0.5 (0.4 to 0.7)2 <0.001 403.5 (385.0 to 422.0)1 0.036
School term
  Ref: Summer 76.0 (72.4 to 79.6) 526.2 (508.6 to 543.8) 29.2 (25.5 to 33.5) 1.5 (1.2 to 1.9) 353.8 (339.2 to 368.3)
  Autumn 72.7 (67.3 to 78.0) 0.310 520.5 (494.0 to 547.0) 0.726 21.3 (17.4 to 26.2) 0.012 1.7 (1.2 to 2.4) 0.619 363.2 (341.5 to 384.9) 0.481
  Spring 70.7 (66.0 to 75.3) 0.068 490.5 (467.9 to 513.2) 0.012 23.1 (19.3 to 27.7) 0.042 1.3 (1.0 to 1.7) 0.326 385.0 (365.8 to 404.2) 0.010
Area-level SES
  Ref: Low 73.0 (68.2 to 77.7) 499.7 (477.0 to 522.3) 23.1 (18.8 to 28.4) 1.4 (1.0 to 2.0) 377.5 (355.3 to 399.7)
  Middle 73.9 (69.9 to 77.9) 0.740 530.1 (511.1 to 549.2) 0.022 27.2 (23.0 to 32.3) 0.208 1.5 (1.1 to 1.9) 0.873 349.0 (330.7 to 367.3) 0.042
  High 73.9 (71.0 to 76.8) 0.716 513.6 (499.5 to 527.6) 0.238 25.4 (22.6 to 28.5) 0.412 1.5 (1.3 to 1.9) 0.623 367.0 (354.7 to 379.2) 0.393
Body fat status3
  Ref: Normal 73.9 (71.3 to 76.4) 515.3 (502.7 to 527.9) 25.5 (23.1 to 28.1) 1.6 (1.3 to 1.8) 364.0 (353.7 to 374.4)
  Overfat 72.2 (66.5 to 77.8) 0.539 512.6 (488.3 to 536.9) 0.816 24.4 (18.9 to 31.5) 0.734 1.0 (0.7 to 1.5) 0.022 370.8 (345.4 to 396.3) 0.596

Statistical comparisons were made by multilevel modelling accounting for repeated-measures and within-school clustering. All factors mutually adjusted for one another and age. PAEE, Physical activity energy expenditure. Moderate and vigorous physical activity were transformed using natural log as these variables were skewed before analysis; presented values have been exponentiated back to the original scale. 1Significantly different to Saturday, p < 0.001; 2Significantly different to Saturday, p = 0.015; 3Normal: <85th percentile of age- and gender-specific fat mass index, Overfat: ≥85th percentile of age- and gender-specific fat mass index.

Collings et al.

Collings et al. International Journal of Behavioral Nutrition and Physical Activity 2014 11:23   doi:10.1186/1479-5868-11-23

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