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Predictors of validity and reliability of a physical activity record in adolescents

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Abstract
Background: Poor to moderate validity of self-reported physical activity instruments is commonly observed in young people in low- and middle-income countries. However, the reasons for such low validity have not been examined in detail. We tested the validity of a self-administered daily physical activity record in adolescents and assessed if personal characteristics or the convenience level of reporting physical activity modified the validity estimates. Methods: The study comprised a total of 302 adolescents from an urban and rural area in Ecuador. Validity was evaluated by comparing the record with accelerometer recordings for seven consecutive days. Test-retest reliability was examined by comparing registrations from two records administered three weeks apart. Time spent on sedentary (SED), low (LPA), moderate (MPA) and vigorous (VPA) intensity physical activity was estimated. Bland Altman plots were used to evaluate measurement agreement. We assessed if age, sex, urban or rural setting, anthropometry and convenience of completing the record explained differences in validity estimates using a linear mixed model. Results: Although the record provided higher estimates for SED and VPA and lower estimates for LPA and MPA compared to the accelerometer, it showed an overall fair measurement agreement for validity. There was modest reliability for assessing physical activity in each intensity level. Validity was associated with adolescents? personal characteristics: sex (SED: P ?=?0.007; LPA: P ?=?0.001; VPA: P ?=?0.009) and setting (LPA: P ?=?0.000; MPA: P ?=?0.047). Reliability was associated with the convenience of completing the physical activity record for LPA (low convenience: P ?=?0.014; high convenience: P ?=?0.045). Conclusions: The physical activity record provided acceptable estimates for reliability and validity on a group level. Sex and setting were associated with validity estimates, whereas convenience to fill out the record was associated with better reliability estimates for LPA. This tendency of improved reliability estimates for adolescents reporting higher convenience merits further consideration.
Keywords
Ecuador, Diary, Accelerometers, Validity, Convenience, HEALTH, Low- and middle-income countries, ACTIVITY QUESTIONNAIRE, SELF-REPORT, INTERNATIONAL SURVEY, SEDENTARY BEHAVIOR, ENERGY-EXPENDITURE, YOUNG-PEOPLE, CHILDREN, YOUTH, ACCELEROMETER

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Chicago
Verstraeten, Roosmarijn, Carl Lachat, Angélica María Ochoa Avilés, Maria Hagströmer, Lieven Huybregts, Dolores Susana Andrade Tenesaca, Silvana Donoso, John Van Camp, Lea Maes, and Patrick Kolsteren. 2013. “Predictors of Validity and Reliability of a Physical Activity Record in Adolescents.” Bmc Public Health 13.
APA
Verstraeten, Roosmarijn, Lachat, C., Ochoa Avilés, A. M., Hagströmer, M., Huybregts, L., Andrade Tenesaca, D. S., Donoso, S., et al. (2013). Predictors of validity and reliability of a physical activity record in adolescents. BMC PUBLIC HEALTH, 13.
Vancouver
1.
Verstraeten R, Lachat C, Ochoa Avilés AM, Hagströmer M, Huybregts L, Andrade Tenesaca DS, et al. Predictors of validity and reliability of a physical activity record in adolescents. BMC PUBLIC HEALTH. 2013;13.
MLA
Verstraeten, Roosmarijn, Carl Lachat, Angélica María Ochoa Avilés, et al. “Predictors of Validity and Reliability of a Physical Activity Record in Adolescents.” BMC PUBLIC HEALTH 13 (2013): n. pag. Print.
@article{4212324,
  abstract     = {Background: Poor to moderate validity of self-reported physical activity instruments is commonly observed in young people in low- and middle-income countries. However, the reasons for such low validity have not been examined in detail. We tested the validity of a self-administered daily physical activity record in adolescents and assessed if personal characteristics or the convenience level of reporting physical activity modified the validity estimates.
Methods: The study comprised a total of 302 adolescents from an urban and rural area in Ecuador. Validity was evaluated by comparing the record with accelerometer recordings for seven consecutive days. Test-retest reliability was examined by comparing registrations from two records administered three weeks apart. Time spent on sedentary (SED), low (LPA), moderate (MPA) and vigorous (VPA) intensity physical activity was estimated. Bland Altman plots were used to evaluate measurement agreement. We assessed if age, sex, urban or rural setting, anthropometry and convenience of completing the record explained differences in validity estimates using a linear mixed model.
Results: Although the record provided higher estimates for SED and VPA and lower estimates for LPA and MPA compared to the accelerometer, it showed an overall fair measurement agreement for validity. There was modest reliability for assessing physical activity in each intensity level. Validity was associated with adolescents? personal characteristics: sex (SED: P ?=?0.007; LPA: P ?=?0.001; VPA: P ?=?0.009) and setting (LPA: P ?=?0.000; MPA: P ?=?0.047). Reliability was associated with the convenience of completing the physical activity record for LPA (low convenience: P ?=?0.014; high convenience: P ?=?0.045).
Conclusions: The physical activity record provided acceptable estimates for reliability and validity on a group level. Sex and setting were associated with validity estimates, whereas convenience to fill out the record was associated with better reliability estimates for LPA. This tendency of improved reliability estimates for adolescents reporting higher convenience merits further consideration.},
  articleno    = {1109},
  author       = {Verstraeten, Roosmarijn and Lachat, Carl and Ochoa Avil{\'e}s, Ang{\'e}lica Mar{\'i}a and Hagstr{\"o}mer, Maria and Huybregts, Lieven and Andrade Tenesaca, Dolores Susana and Donoso, Silvana and Van Camp, John and Maes, Lea and Kolsteren, Patrick},
  issn         = {1471-2458},
  journal      = {BMC PUBLIC HEALTH},
  language     = {eng},
  pages        = {11},
  title        = {Predictors of validity and reliability of a physical activity record in adolescents},
  url          = {http://dx.doi.org/10.1186/1471-2458-13-1109},
  volume       = {13},
  year         = {2013},
}

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