Exploration of Confounding Due to Poor Health in an Accelerometer-Mortality Study.

ABSTRACT:

Purpose

Confounding due to poor health is a concern in accelerometer-based studies of physical activity and health, but detailed investigations of this source of bias are lacking.

Methods

US adults (n = 4840) from the National Health and Nutrition Examination Survey (2003 to 2006) wore an accelerometer for 1 to 7 d (mean = 5.7 d) and were followed for mortality through 2015. Logistic regression was used to examine odds ratios between poor health (chronic conditions, self-reported health, mobility limitations, frailty) and low physical activity levels; Cox models were used to estimate adjusted hazard ratios (HR) and 95% CI for mortality associations for a 1 h·d increase in moderate-to-vigorous-intensity physical activity (MVPA) using two commonly used cut-points (MVPA760, MVP

SUBMITTER: Matthews CE 

PROVIDER: S-EPMC7669589 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature