All schools was classified of the Chilean Ministry from Studies towards the about three profile, specifically reduced-achieving schools, mid-finding schools and highest-finding universities, based upon new performance of its pupils throughout SIMCE evaluation ( thirty-two ) .
Anthropometric dimensions and nutritional position
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
Socio-financial updates
Socio-economic position (SES) is mentioned having fun with a size according to Graffar’s changed means hence is modified in order to Chilean urban and you may outlying communities ( Source Alvarez, Muzzo and you will Ivaple to your four socio-monetary organizations: 1=high (0·3 %); 2=mid–highest (14·seven %); 3=middle (step three8·step three %); 4=mid–lower (45·6 %); and you may 5=lowest (step 1·step one %). Yet not, in our investigation i blended these four categories for the three: high (1+2), center (3) and you can lowest (4+5) SES.
Statistical study
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.
Show
Our very own test is made right up out-of thirteen·step one ( sd dos·3) year-dated male (52 %) and you will lady (48 %) kids from low (44·step 3 %), middle (39·six %) and you may high (16·step 1 %) SES. They attended fifth (51·nine %) and 9th (48·step one %) meddle levels in public areas (34·8 %), partially paid (57·8 %) and personal universities (7·cuatro %) from the Santiago Metropolitan Part. As for health updates, forty-five % of participants have been obese or fat. Almost 1 / 2 of the young (forty-eight %) went to large-reaching colleges, while 31 % and you can 23 % attended middle- and reasonable-reaching colleges, correspondingly.
From the take to, 56 % out of children stated usage of factors in the snack day which were packed with body weight, glucose, sodium and energy. Thirty-half dozen % was indeed regarded as for worst-to-reasonable snack, whereas only 8 % have been thought to consume fit factors during the snack time at the college. Dining table step 1 gets the descriptive analytics of the sample. Average philosophy of score for the Language and you can Math was indeed somewhat ong people who have straight down health quality of meals at school (P=0·01). New show away from people drinking unhealthy foods at school was rather highest certainly 9th graders (59 %; P=0·040), children browsing reasonable-reaching schools (61 %; P=0·036), along with one of underweight and regular-lbs users (69 % and you may 62 %, respectively; P=0·006).
