All of the colleges have been classified because of the sugarbook Chilean Ministry out of Degree on three account, particularly reasonable-finding schools, mid-gaining colleges and you will highest-finding colleges, established the fresh performance of the youngsters throughout SIMCE screening ( thirty-two ) .
Anthropometric specifications and you can nutritional status
Standardized procedures were used to measure students’ weight to the nearest 0·1 kg, using a Seca scale (SECA, Hamburg, Germany), and height to the nearest 0·1 cm, using a Holtain stadiometer. All instruments were verified before measuring each participant ( Reference Gibson 33 ) . BMI (kg/m 2 ) and height-for-age were evaluated, and Z-scores were obtained according to the references of the Centers for Disease Control, National Center for Health Statistics (USA) ( Reference Kuczmarski, Ogden and Guo 34 ) . Nutritional status was defined as follows: underweight, BMI Z-score 1; normal weight, BMI Z-score from ?1 to +1; overweight, BMI Z-score from +1 to +<2; and obesity, BMI Z-score ?+2.
Socio-economic condition (SES) are counted having fun with a level based on Graffar’s changed means and therefore is adapted to Chilean metropolitan and rural communities ( Resource Alvarez, Muzzo and you will Ivaple on the five socio-monetary communities: 1=large (0·step three %); 2=mid–higher (14·eight %); 3=middle (38·3 %); 4=mid–lowest (45·six %); and 5=reasonable (1·step 1 %). Yet not, in our investigation we combined such five groups toward around three: large (1+2), center (3) and reasonable (4+5) SES.
Statistical analysis included performing ? 2 tests to compare categorical variables, and ANOVA and Bonferroni tests for comparison of continuous variables. After performing bivariate analyses with each potential confounding variable, including sex, grade, nutritional status, SES and school’s performance, we used logistic regression to assess the relationship between the nutritional quality of snacks at school (exposure) and individual academic performance in Mathematics and Language (outcome). In each case, the probability of passing the test was estimated using three models. In the second model, SES was added. Finally, a fully adjusted model contained all mentioned covariates with the addition of a variable denoting the school’s academic performance. Because the variable school’s performance was partly derived from the outcome variables, this adjustment may cause underestimation of the association, so we included models with and without adjustment for school’s performance. A P value of <0·05 denoted statistical significance. Data were processed using the statistical software package Stata SE for Windows version 12·0.
Our very own take to is made upwards out of thirteen·step 1 ( sd dos·3) year-dated men (52 %) and you can ladies (forty eight %) teenagers away from reduced (44·3 %), center (39·six %) and higher (step 16·1 %) SES. It went to fifth (51·nine %) and you may 9th (48·step 1 %) degree in public (34·8 %), partly sponsored (57·8 %) and private universities (7·4 %) on the Santiago Metropolitan Part. For nutritional updates, 45 % of professionals had been over weight or obese. Almost half of the young (forty-eight %) attended higher-gaining universities, whereas 31 % and you can 23 % went to middle- and reasonable-gaining schools, respectively.
In the sample, 56 % away from people reported consumption of factors within snack day which were full of pounds, sugar, sodium and effort. Thirty-half a dozen % was in fact considered having worst-to-fair snacking, while just 8 % were considered to consume fit activities from inside the treat date from the school. Dining table step 1 has the detailed analytics of your own try. Mediocre thinking of scores when you look at the Language and you can Mathematics was in fact significantly ong those with lower health quality of delicacies at school (P=0·01). New share out-of college students consuming below average dinners at school try significantly highest certainly one of 9th graders (59 %; P=0·040), students going to reasonable-reaching colleges (61 %; P=0·036), together with certainly skinny and you can normal-pounds people (69 % and you will 62 %, respectively; P=0·006).