Saturday, 29 October 2011
Bertha Cecilia Salazar, PhD
Nursing, Universidad Autonoma de Nuevo Leon, Monterrey, Mexico
Rosa M. Cruz, MNS, BNS
School of Nursing, Universidad Autónoma de Nuevo León, Monterrey, Mexico
Raquel Benavides
Nursing, Universidad Autónoma de Nuevo León/FAEN, Monterrey, Nuevo León, Mexico
Learning Objective 1: The learner will be able to learn about instrument development procedures.
Learning Objective 2: The learner will be able to learn about physical activity in Mexican young students.
Objective: Design and test two instruments that measure competing demands and preferences that may interfere with physical activity of young students. The instruments were developed based on the Health Promotion Model and strategies to design instruments.
Methods. Correlational model testing design. The present analysis includes a subsample of 447 students from upper public high schools and students from a public university. Systematic random sampling 1 in k (range 57-99) was used considering the total of students enrolled as sampling framework. Strategies to design instruments and procedures were followed. Open ended questions were applied to a small sample (35) of young people, literature review was also considered, to develop the instruments. A panel of experts helped to refine items. The competing demands instrument contains 22 items and competing preferences 35 items.
Results: Mean age is 18.16 years (SD = 2.45); 254 (51.3%) were male, and most of them referred no physical activity practice. The competing preferences instrument showed a Cronbach alpha of .840 and competing demands of .849. Factor analysis, using principal components and varimax rotation was used. Six factors were extracted from the competing demands instrument with eigenvalues above 1, explaining 55.77% of the total variance. The preferences instruments revealed 8 factors with eigenvalues above 1, total explained variance = 48.27%. A Student t test showed significant mean differences between students who do not practice physical activity and those that do, in both instruments (t = -9.25; gl = 475; p < .001) preferences, and (t = 5.46; gl = 475; p < .001) demands. Those who practice physical activities showed less competing demands and preferences than those who said not practice physical activity. Conclusions. Results show preliminary validty, furhter testing is needed.
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