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Table 4 Mediation analyses for associations between parental and peer variables and MVPA on weekdays and weekend days

From: Exploring associations between parental and peer variables, personal variables and physical activity among adolescents: a mediation analysis

MVPA on weekdays
  α, SE β, SE αβ, SE % mediated
(95%CI) (95%CI) (95%CI)
Parental logistic support for PA
Potential mediators     
Self-efficacy 0.175, 0.054 0.032, 0.028 0.006, 0.005 -
(0.069;0.281)** (−0.023;0.087) (−0.005;0.016)
Internal barriers −0.044, 0.010 −0.341, 0.153 0.015, 0.008 42.9%
(−0.064;-0.024)*** (−0.641;-0.041)* (0.000;0.030)*
External barriers −0.040, 0.009 −0.249, 0.157 0.010, 0.007 -
(−0.058;-0.022)*** (−0.557;0.059) (−0.003;0.023)
Parental control of PA
Potential mediators     
Self-efficacy −0.367, 0.099 0.027, 0.028 −0.010, 0.011 -
(−0.561;-0.173)*** (−0.028;0.082) (−0.031;0.011)
Internal barriers 0.054, 0.018 −0.301, 0.145 −0.016, 0.010 29.0%
(0.019;0.089)** (−0.585;-0.017)* (−0.035;0.002)
External barriers 0.020, 0.018 −0.284, 0.149 −0.006, 0.006 -
(−0.015;0.055) (−0.576;0.008) (−0.017;0.006)
Parental concern about PA
Potential mediators     
Self-efficacy −1.099,0.291 0.023, 0.028 −0.025, 0.031 -
(−1.669;-0.529)*** (−0.032;0.078) (−0.087;0.036)
Internal barriers 0.225, 0.053 −0.280, 0.153 −0.063, 0.037 35.0%
(0.121;0.329)*** (−0.580;0.020) (−0.136;0.010)
External barriers 0.153, 0.053 −0.237, 0.156 −0.036, 0.027 -
(0.038;0.288)** (−0.543;0.069) (−0.089;0.017)
Peer interest in PA
Potential mediators     
Self-efficacy 0.163,0.064 0.029, 0.028 0.005, 0.005 -
(0.038;0.288)* (−0.026;0.084) (−0.005;0.014)
Internal barriers −0.037, 0.012 −0.311, 0.143 0.012, 0.006 32.0%
(−0.061;-0.012)** (−0.591;-0.031)* (−0.001;0.024)
External barriers −0.029, 0.011 −0.268, 0.152 0.008, 0.005 -
(−0.051;-0.007)** (−0.566;0.030) (−0.003;0.018)
MVPA on weekend days
  α (SE) β (SE) αβ (SE) % mediated
(95%CI) (95%CI) (95%CI)
Parental co-participation in PA
Potential mediators     
Self-efficacy 0.042, 0.067 0.054, 0.056 0.002, 0.004 -
(−0.089;0.173) (−0.056;0.164) (−0.006;0.011)
Internal barriers −0.009, 0.012 −0.729, 0.306 0.007, 0.009 -
(−0.033;0.015) (−1.329;-0.129)* (−0.011;0.025)
External barriers −0.009, 0.012 0.702, 0.324 0.006, 0.009 -
(−0.033;0.015) (−1.337;-0.067)* (−0.011;0.024)
Parental logistic support for PA
Potential mediators     
Self-efficacy 0.175, 0.054 0.025, 0.059 0.004, 0.010 -
(0.069;0.281)** (−0.091;0.141) (−0.016;0.025)
Internal barriers −0.045, 0.010 −0.585, 0.333 0.026, 0.016 -
(−0.065;-0.025)*** (−1.238;0.068) (−0.005;0.058)
External barriers −0.040, 0.010 −0.545, 0.347 0.019, 0.013 -
(−0.058;-0.021)*** (−1.225;0.135) (−0.006;0.044)
Parental praise of PA
Potential mediators     
Self-efficacy 0.103, 0.051 0.039, 0.058 0.004, 0.006 -
(0.003;0.203)* (−0.075;0.153) (−0.008;0.016)
Internal barriers −0.031, 0.010 −0.585, 0.325 0.018, 0.012 -
(−0.051;-0.011)** (−1.238;0.068) (−0.005;0.041)
External barriers −0.020, 0.009 −0.640, 0.330 0.013, 0.009 -
(−0.038;-0.002)* (−1.287;0.007) (−0.004;0.030)
  1. Analyses were adjusted for adolescents’ sex, maternal education, total accelerometer wear-time and days worn; β-path was adjusted for the independent variables; MVPA, moderate- to vigorous physical activity; SE, standard error; CI, confidence interval; p < 0.1 (indicated in italic); *p < 0.05 (indicated in bold); **p < 0.01 (indicated in bold); ***p < 0.001 (indicated in bold).