Effect of activity and television viewing on BMI z-score in early adolescents in Turkey
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- Özmert, E.N., Özdemir, R., Pektaş, A. et al. World J Pediatr (2011) 7: 37. doi:10.1007/s12519-011-0243-2
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Television, computer and other causes of increased inactivity are reported to be among the major causes of obesity. This cross-sectional study was aimed to evaluate the effect of television viewing and other daily activities on body mass index (BMI) z-score of early adolescents.
A total of 860 students and their parents (581) from different socioeconomic level schools were included. They were instructed to fill in a self-designed questionnaire. Weight and height were measured, and BMI z-scores were calculated.
BMI z-score was higher in boys and in those attending high socioeconomic level schools. Children with a BMI z-score >2SD watched television (2.5±0.9 h/day) longer than those with <-2SD (1.6±0.8 h/day) (P=0.027). The three categories (<-2SD, -2SD-2SD, >2SD) differed significantly according to maternal (P<0.05) and paternal (P<0.005) BMI. Linear logistic regression analysis revealed that socioeconomic level, maternal BMI and paternal BMI are factors affecting BMI z-score significantly.
Genetic and/or family environment which may affect the nutrition and activity of adolescents seems to be the most important factor affecting their BMI z-score.