Browsing by Author "Blackstaffe, Anita"

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    Associations between Aspects of Friendship Networks, Physical Activity, and Sedentary Behaviour among Adolescents
    (2014-09-24) Sawka, Keri Jo; McCormack, Gavin R.; Nettel-Aguirre, Alberto; Blackstaffe, Anita; Perry, Rosemary; Hawe, Penelope
    Background. Adolescent friendships have been linked to physical activity levels; however, network characteristics have not been broadly examined. Method. In a cross-sectional analysis of 1061 adolescents (11–15 years), achieving 60 minutes/day of moderate-to-vigorous physical activity (MVPA) and participating in over 2 hours/day of sedentary behaviour were determined based on friendship network characteristics (density; proportion of active/sedentary friends; betweenness centrality; popularity; clique membership) and perceived social support. Results. Adolescents with no friendship nominations participated in less MVPA. For boys and girls, a ten percent point increase in active friends was positively associated with achievement of 60 minutes/day of MVPA (OR 1.11; 95% CI 1.02–1.21, OR 1.14; 95% CI 1.02–1.27, resp.). For boys, higher social support from friends was negatively associated with achieving 60 minutes/day of MVPA (OR 0.63; 95% CI 0.42–0.96). Compared with low density networks, boys in higher density networks were more likely to participate in over 2 hours/day of sedentary behaviour (OR 2.93; 95% CI 1.32–6.49). Social support from friends also modified associations between network characteristics and MVPA and sedentary behaviour. Conclusion. Different network characteristics appeared to have different consequences. The proportion of active close friends was associated with MVPA, while network density was associated with sedentary behaviour. This poses challenges for intervention design.
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    Test–retest Reliability and Construct Validity of an Online and Paper Administered Physical Activity Neighborhood Environment Scale (PANES)
    (Taylor & Francis, 2019-07-09) Frehlich, Levi; Blackstaffe, Anita; McCormack, Gavin R.
    Physical Activity Neighborhood Environment Scale (PANES) has been used internationally; however, PANES properties have not been assessed in all geographical contexts. Our objectives were to assess the reliability and validity of an online and paper version of the PANES in Canadian adults. Reliability was estimated using intraclass correlation coefficients (ICC), percentage overall agreement (p0) and Cohen’s Kappa coefficient (κ). Lower 95% confidence interval(CI) ICC ranged from 0.10 to 0.70. Lower 95%CI for κ statistics ranged from -0.20 to 0.64 and p0 ranged from 80.1 to 95.7%. Cronbach’s alpha coefficients (α) estimated internal consistency of the PANES (α = 0.58 for the paper version and α = 0.55 for the online version). Mean scores for the PANES Built Environment Index (BEI) significantly differed by neighborhood street pattern (p < 0.05). The PANES administrated via paper or online, provides reliable overall agreement and valid estimates of the self-reported neighborhood built environment supportiveness of physical activity.