Abstract
Objective. To test the validity and reliability of a self-efficacy scale for physical activity (PA) in Brazilian adults. Methods. A self-efficacy scale was applied jointly with a multidimensional questionnaire through face-to-face interviews with 1 418 individuals (63.4% women) aged ≥?18 years. The scale was submitted to validity (factorial and construct) and reliability analysis (internal consistency and temporal stability). A test-retest procedure was conducted with 74 individuals to evaluate temporal stability. Results. Exploratory factor analyses revealed two independent factors: self-efficacy for walking and self-efficacy for moderate and vigorous PA (MVPA). Together, these two factors explained 65.4% of the total variance of the scale (20.9% and 44.5% for walking and MVPA, respectively). Cronbach's alpha values were 0.83 for walking and 0.90 for MVPA, indicating high internal consistency. Both factors were significantly and positively correlated (rho ≥?0.17, P < 0.001) with quality of life indicators (health perception, self-satisfaction, and energy for daily activities), indicating an adequate construct validity. Conclusions. The scale's validity, internal consistency, and reliability were adequate to evaluate self-efficacy for PA in Brazilian adults.
Translated title of the contribution | Psychometric properties of a self-efficacy scale for physical activity in Brazilian adults |
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Original language | Portuguese |
Pages (from-to) | 259-266 |
Number of pages | 8 |
Journal | Revista Panamericana de Salud Publica/Pan American Journal of Public Health |
Volume | 29 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2011 |
Externally published | Yes |
Keywords
- Brazil
- Exercise
- Motor activity
- Psychometrics
- Self-efficacy
ASJC Scopus subject areas
- Public Health, Environmental and Occupational Health