Body Mass Index and Physical Inactivity: 2013 BRFSS

Area of Science:

• Public Health
• Epidemiology
• Human Physiology

Background:

• Physical inactivity (PI) is a growing public health concern linked to numerous chronic diseases.
• Body Mass Index (BMI) is a common metric used to categorize weight status, but its association with self-reported PI requires further examination.
• Understanding how different BMI categories influence the likelihood of reporting physical inactivity is crucial for targeted health interventions.

Purpose of the Study:

• To examine the odds of adults reporting physical inactivity (PI) across six distinct body mass index (BMI) categories.
• To compare the odds of reporting PI between men and women within each BMI category.

Main Methods:

• Utilized data from the 2013 Behavioral Risk Factor Surveillance System (BRFSS).
• Classified participants into six body mass index (BMI) categories.
• Calculated odds ratios (OR) and 95% confidence intervals (CI) to compare the odds of reporting PI across BMI categories, with desirable weight (18.5-24.9 kg/m²) as the referent group.

Main Results:

• Both underweight and obese men and women reported significantly higher odds of physical inactivity compared to those of desirable weight.
• Men in class III obesity had the highest odds of reporting PI (OR 2.44), followed by women in class III obesity (OR 2.89).
• Women exhibited greater odds of reporting PI than men in four of the five non-desirable BMI categories.

Conclusions:

• Significant within- and between-sex differences exist in the odds of reporting physical inactivity, varying by BMI category.
• The underweight BMI category warrants inclusion in future research on physical inactivity and sedentary behavior due to its clinical relevance.
• Findings highlight the complex relationship between weight status, sex, and physical activity levels, informing public health strategies.