62043 20210121114512.0 doi 10.3305/nh.2015.32.4.9490 sideral 92654 ART-2015-92654 eng (orcid)0000-0002-8374-3410 Julián Almárcegui, C. Universidad de Zaragoza Validity of a food-frequency questionnaire for estimating calcium intake in adolescent swimmers 2015 Access copy available to the general public Unrestricted Introduction: accurate estimates of the intake of specific nutrients such as calcium (Ca) are crucial to correctly rank or classify subjects in the distribution of intakes. Therefore, we aimed to estimate the relative validity of a food frequency questionnaire (FFQ) for measuring Ca intake in two different groups of healthy adolescents, a normoactive control group and a physically active group of swimmers with 2 non-consecutive 24h recalls (2 x 24HR) collected as the reference method. Methods: Pearson correlations, agreement between the 24HR and the FFQ at an individual level and questionnaire’s ability to assign individuals to the same quartile of intake as the 24HR were calculated. Results: mean daily Ca intakes were 564.6 mg (SD 232.0) and 895.9 mg (SD 343.1) for the 2 x 24HR and FFQ respectively in controls (P < 0.001); and 731.9 mg (SD 299.8) and 979.8 mg (SD 408.5) for the 2 x 24HR and FFQ respectively in swimmers (P < 0.001). Pearson correlations were 0.52 for controls and 0.47 for swimmers after correcting for intra-variability. Cross-classification analysis indicated that 73.7% of controls and 63.1% of swimmers were classified correctly or in the adjacent category. Also, the 89% of the control group and 79% of swimmers were classified correctly with the FFQ according to the dietary reference intake (DRI) of 1300 mg/d. Conclusions: for both groups, the FFQ tended to overestimate Ca intake, however it demonstrated fairly good ability to classify subjects into extremes of Ca intake and identified adolescents having Ca intakes lower than the dietary reference intake. info:eu-repo/grantAgreement/ES/MINECO/BES-2012-051888 info:eu-repo/grantAgreement/ES/MICINN/DEP2011-29093 info:eu-repo/grantAgreement/ES/MEC/FPU13-00421 info:eu-repo/grantAgreement/ES/MEC/AP-2012-02854 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 1.497 2015 NUTRITION & DIETETICS 60 / 80 = 0.75 2015 Q3 T3 0.404 2015 Nutrition and Dietetics 2015 Q3 Medicine (miscellaneous) 2015 Q3 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Huybrechts, I. (orcid)0000-0002-0520-1640 Gómez Bruton, A. Universidad de Zaragoza (orcid)0000-0001-8500-1667 Matute Llorente, Á. Universidad de Zaragoza González Agüero, A. (orcid)0000-0001-6492-2512 Gómez Cabello, A. (orcid)0000-0003-0454-653X Moreno, L. A. Universidad de Zaragoza (orcid)0000-0002-7215-6931 Casajús, J. A. Universidad de Zaragoza (orcid)0000-0002-4303-4097 Vicente Rodríguez, G. Universidad de Zaragoza 1006 255 Universidad de Zaragoza Dpto. Fisiatría y Enfermería Área Enfermería 1006 245 Universidad de Zaragoza Dpto. Fisiatría y Enfermería Área Educación Física y Depor. 32, 4 (2015), 1773-1779 Nutr. hosp. Nutricion Hospitalaria 0212-1611 406406 http://zaguan.unizar.es/record/62043/files/texto_completo.pdf Versión publicada 114638 http://zaguan.unizar.es/record/62043/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:62043 articulos driver 2021-01-21-10:57:57 ARTICLE