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Table 2 Associations between baseline body fat level and baseline level of the outcome with changes in PA/sedentary time (n = 144; 50 % boys; data are β (95 % CI))

From: Magnitude and determinants of change in objectively-measured physical activity, sedentary time and sleep duration from ages 15 to 17.5y in UK adolescents: the ROOTS study

 

PAEE

P

ST

P

LPA

P

MPA

P

VPA

P

MVPA

P

SLP

P

 

(Δ kJ/kg/day/year)

(Δ min/d/year)

(Δ min/night/year)

 

FMI (kg/m2)1

              

Model 1

0.17 (-0.49 to 0.82)

0.56

B:-6.0 (-16.1 to 4.1)

0.20

B: 4.8 (-1.3 to 10.8)

0.11

0.030 (-1.0 to 1.1)

0.95

0.0097 (-0.42 to 0.44)

0.96

0.040 (-1.0 to 1.1)

0.93

0.91 (-2.7 to 4.6)

0.57

G:-0.098 (-7.2 to 7.0)

0.98

G:-0.54 (-6.9 to 5.8)

0.85

Model 2

0.094 (-0.47 to 0.66)

0.71

B:-7.0 (-13.4 to -0.56)

0.037

B: 7.8 (5.6 to 10.0)

<0.001

-0.10 (-1.0 to 0.78)

0.79

-0.35 (-0.73 to 0.035)

0.069

-0.45 (-1.4 to 0.54)

0.32

-1.0 (-3.2 to 1.2)

0.31

G:-0.17 (-6.8 to 6.4)

0.95

G:-0.51 (-5.0 to 6.1)

0.84

FFMI (kg/m2)1

              

Model 1

0.34 (-0.51 to 1.2)

0.38

B:-3.6 (-11.5 to 4.3)

0.32

B: 2.8 (-3.1 to 8.8)

0.30

0.16 (-1.3 to 1.6)

0.79

0.089 (-0.39 to 0.57)

0.68

0.25 (-1.2 to 1.7)

0.70

0.68 (-2.7 to 4.0)

0.65

G: -1.1 (-12.7 to 10.5)

0.83

G: 0.076 (-7.8 to 9.3)

0.84

Model 2

0.32 (-0.55 to 1.2)

0.41

B:-4.8 (-8.9 to -0.77)

0.026

B: 5.8 (4.2 to 7.4)

<0.001

0.13 (-0.31 to 0.57)

0.50

-0.26 (-0.80 to 0.29)

0.31

-0.12 (-0.78 to 0.54)

0.68

-1.6 (-3.8 to 0.57)

0.13

G: 0.59 (-12.3 to 11.1)

0.91

G: 1.8 (-7.2 to 10.8)

0.65

WC (cm)1,2

              

Model 1

-0.0012 (-0.11 to 0.11)

0.98

B:-1.4 (-3.3 to 0.67)

0.16

B: 1.2 (0.17 to 2.3)

0.028

0.034 (-0.24 to 0.30)

0.78

0.0061 (-0.15 to 0.16)

0.93

0.040 (-0.27 to 0.35)

0.77

0.11 (-0.73 to 0.95)

0.77

G: 0.71 (-0.50 to 1.9)

0.21

G:-0.86 (-1.9 to 0.23)

0.11

Model 2

0.0092 (-0.092 to 0.11)

0.84

B:-1.7 (-3.1 to -0.34)

0.021

B: 1.8 (1.1 to 2.4)

<0.001

0.030 (-0.16 to 0.22)

0.72

-0.059 (-0.15 to 0.027)

0.15

-0.028 (-0.20 to 0.14)

0.71

-0.13 (-0.76 to 0.51)

0.66

G: 0.51 (-0.77 to 1.8)

0.38

G:-0.54 (-1.5 to 0.46)

0.25

Baseline of outcome

-0.20 (-0.23 to -0.17)

<0.001

-0.15 (-0.23 to -0.073)

0.003

-0.15 (-0.23 to -0.072)

0.003

-0.30 (-0.35 to -0.24)

<0.001

-0.32 (-0.42 to -0.22)

<0.001

-0.31 (-0.36 to -0.26)

<0.001

-0.33 (-0.39 to -0.27)

<0.001

  1. Statistical comparisons made by linear regression accounting for within-school clustering; Model 1: adjusted for baseline age, sex, area-level SES, ethnicity, follow-up duration, the total and weekend hours of monitor wear time and the seasons (school terms) of activity measurements at baseline and follow-up; WC models were additionally adjusted for baseline height; Model 2: as per model 1 but also including baseline value of the outcome. Coefficients represent the expected mean change (95 % confidence interval in parentheses) in PA, ST or SLP per unit increase in independent variables. LPA, light physical activity; MPA, moderate physical activity; MVPA, moderate-to-vigorous physical activity; PAEE: physical activity energy expenditure; SLP, sleep duration; ST, sedentary time; VPA, vigorous physical activity. 1Results for ST and LPA are stratified by gender (B, Boys; G, Girls) because of significant sex*fatness interactions, for all other variables results are for genders combined; 2Due to missing data based on 140 participants (69 boys and 71 girls)