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Introduction Physical activity (PA) is essential to healthy mental and physical development in early life. However, the prevalence of physical inactivity, which is considered a key modifiable driver of childhood obesity, has reached alarming levels among European youth. There is a need to update the data for Spain, in order to establish if current measures are effective or new approaches are needed. Methods and analysis We present the protocol for Physical Activity, Sedentarism, lifestyles and Obesity in Spanish youth (PASOS). This observational, nationally representative, multicentre study aims to determine the PA levels, sedentary behaviours and prevalence of physical inactivity (defined as <60 min of moderate to vigorous PA per day) in a representative sample of Spanish children and adolescents. The PASOS study has recruited a representative random sample of children and adolescents aged 8-16 years from 242 educational centres in the 17 'autonomous regions' into which Spain is divided. The aim is to include a total of 4508 youth participants and their families. Weight, height and waist circumference will be measured by standardised procedures. Adherence to the Mediterranean diet, quality of life, sleep duration, PA and sedentary behaviour are being measured by validated questionnaires. PA is measured by the Physical Activity Unit 7-item Screener. A representative subsample (10% of participants) was randomly selected to wear accelerometers for 9 days to obtain objective data on PA. Parents are asked about their educational level, time spent doing PA, diet quality, self-perceived stress, smoking habit, weight, height, their child's birth weight and if the child was breast fed. ; PASOS study has been funded mainly by Fundación PROBITAS and Gasol Foundation. Additional funds were received from the Barça Foundation, Banco Santander, IFA, Viena and Fundación Deporte Jóven. MMB is funded by the official funding agency for biomedical research of the Spanish government, Institute of Health Carlos III (ISCIII), which is cofunded by the European Regional Development Fund (CIBEROBN CB12/03/30038), grant of support to research groups number 35/2011 (Balearic Islands Gov) and EU COST Action CA16112. PASOS has the institutional support of Spain's Ministry of Education and Vocational Training, the Ministry of Health, Consumption and Social Welfare through the Spanish Agency for Food Safety and Nutrition (ASEAN), the High Commission against Child Poverty, the High Sports Council, the General College of Professional Associations of Physical Education and Sports, and the Departments of Education and/or Health and/or Sports of Spain's 17 autonomous regions. The CIBERESP and the CIBEROBN are initiatives of the Institute of Health Carlos III, Madrid, Spain.

Evidence has identified unhealthy lifestyle behaviors as the main contributors to obesity in children, so it is essential to identify factors that could influence children's lifestyles. The objective of the present study was to analyze the association of baseline maternal educational level with child's physical activity, screen time, and dietary habits at follow-up. This community-based cohort study was carried out between 2012 and 2014 and included 1405 children aged 8 to 10 years old. Maternal educational level was used as an indicator of child's socioeconomic status. Physical activity, screen time, and dietary habits were assessed by validated questionnaires. The odds of having commercially baked goods for breakfast [OR 1.47 (95% CI 1.03 to 2.10)], going more than once a week to a fast-food restaurant [OR 1.64 (95% CI 1.20 to 2.26)], and taking sweets and candys several times a day [OR 3.23 (95% CI 2.14 to 4.87) were significantly higher among children whose mothers had a lower educational level compared to their peers whose mothers had a higher level. These associations held for taking sweets and candy several times a day after additional adjustment for the corresponding dietary behavior at baseline. Maternal educational level was inversely associated (p < 0.001) with child's screen time at follow up and being in the lowest maternal educational category was associated with an increased odds of surpassing the maximum recommended time of screen time of 120 min per day (OR (95% CI) 1.43 (1.07 to 1.90), p = 0.016). Maternal education is a predictor for unhealthy dietary habits and high screen time in children. ; This work was supported by a grant from Instituto de Salud Carlos III FEDER, (PI11/01900).Centro de Investigación Biomédica en Red Epidemiologia y Salud Publica (CIBERESP) is an initiativeof the Instituto de Salud Carlos III (ISCIII) of Spain, which is financed by the European RegionalDevelopment Fund (ERDF), "A way to make Europe"/"Investing in your future" (CB06/03). Itis supported by the official funding agency for biomedical research of the Spanish government,ISCIII, Spain.

As the most likely primary caregivers, mothers are an integral part of children's social influence and are therefore greatly involved in shaping their children's behaviors. The objectives were to determine the prospective associations between maternal and child diet quality and sedentary behaviors. This study, within the framework of a community-based intervention study, included 1130 children aged 8–10 years and their mothers. The study was carried out during two academic years (2012/2014) with a mean follow-up of 15 months. Exposure and outcome variables were measured at baseline and follow-up, respectively. Diet quality was assessed by the KIDMED questionnaire and the short Diet Quality Screener, respectively. Sedentary behaviors were determined by standardized questions of sedentary behaviors. Maternal consumption of fruits, vegetables, fish, legumes, pasta/rice, dairy products, nuts and baked goods were positively associated (p < 0.05) with the corresponding child behavior. Multiple linear regression models adjusted for sex, age, maternal education and intervention group revealed significant cross-sectional (p < 0.005) and prospective (p < 0.01) associations between maternal and child overall diet quality and sedentary behaviors. Maternal diet quality and sedentary behaviors were predictive for these lifestyle behaviors in children. ; This work was supported by grants from Instituto de Salud Carlos III FEDER, (PI11/01900 and PI20/00199). Centro de Investigación Biomédica en Red Epidemiologia y Salud Publica is an initiative of the Instituto de Salud Carlos III (ISCIII) of Spain, which is financed by the European Regional Development Fund (ERDF), "A way to make Europe"/"Investing in your future" (CB06/03). It is supported by the official funding agency for biomedical research of the Spanish government, ISCIII, Spain

[Abstract] Introduction: Physical activity (PA) is essential to healthy mental and physical development in early life. However, the prevalence of physical inactivity, which is considered a key modifiable driver of childhood obesity, has reached alarming levels among European youth. There is a need to update the data for Spain, in order to establish if current measures are effective or new approaches are needed. Methods and analysis: We present the protocol for Physical Activity, Sedentarism, lifestyles and Obesity in Spanish youth (PASOS). This observational, nationally representative, multicentre study aims to determine the PA levels, sedentary behaviours and prevalence of physical inactivity (defined as <60 min of moderate to vigorous PA per day) in a representative sample of Spanish children and adolescents. The PASOS study has recruited a representative random sample of children and adolescents aged 8–16 years from 242 educational centres in the 17 'autonomous regions' into which Spain is divided. The aim is to include a total of 4508 youth participants and their families. Weight, height and waist circumference will be measured by standardised procedures. Adherence to the Mediterranean diet, quality of life, sleep duration, PA and sedentary behaviour are being measured by validated questionnaires. PA is measured by the Physical Activity Unit 7-item Screener. A representative subsample (10% of participants) was randomly selected to wear accelerometers for 9 days to obtain objective data on PA. Parents are asked about their educational level, time spent doing PA, diet quality, self-perceived stress, smoking habit, weight, height, their child's birth weight and if the child was breast fed. ; PASOS study has been funded mainly by Fundación PROBITAS and Gasol Foundation. Additional funds were received from the Barça Foundation, Banco Santander, IFA, Viena and Fundación Deporte Jóven. MMB is funded by the official funding agency for biomedical research of the Spanish government, Institute of Health Carlos III (ISCIII), which is cofunded by the European Regional Development Fund (CIBEROBN CB12/03/30038), grant of support to research groups number 35/2011 (Balearic Islands Gov) and EU COST Action CA16112. PASOS has the institutional support of Spain's Ministry of Education and Vocational Training, the Ministry of Health, Consumption and Social Welfare through the Spanish Agency for Food Safety and Nutrition (ASEAN), the High Commission against Child Poverty, the High Sports Council, the General College of Professional Associations of Physical Education and Sports, and the Departments of Education and/or Health and/or Sports of Spain's 17 autonomous regions. The CIBERESP and the CIBEROBN are initiatives of the Institute of Health Carlos III, Madrid, Spain. ; Gobierno de las Islas Baleares; 35/2011 ; European Cooperation in Science and Technology; CA16112

[Abstract] The aim of this study is to evaluate if screen time and parents' education levels are associated with adherence to a Mediterranean dietary pattern. This cross-sectional study analyzed a representative sample of 3333 children and adolescents (8 to 16 years) included in the Physical Activity, Sedentarism, lifestyles and Obesity in Spanish youth (PASOS) study in Spain (which ran from March 2019 to February 2020). Data on screen time (television, computer, video games, and mobile phone) per day, Mediterranean diet adherence, daily moderate or vigorous physical activity, and parents' education levels were gathered using questionnaires. A descriptive study of the variables according to sex and parents' education level was performed. Logistic regression models (adjusted by sex and weight status) were fitted to evaluate the independent association between screen time and Kids' level of adherence to the Mediterranean diet (KIDMED) index, as well as some of its items. A greater amount of screen time was associated with worse adherence to the Mediterranean diet; a lower consumption of fruit, vegetables, fish, legumes, and nuts; and a greater consumption of fast food, sweets, and candies. A lower parents' education level was associated with worse adherence to the Mediterranean diet. It is necessary to promote the responsible, limited use of screen time, especially in children with parents with a lower education level. ; The PASOS study was funded by Fundación PROBITAS and the Gasol Foundation. Additional funds were received from the Barça Foundation, Banco Santander, IFA, Vienna and the Fundación Deporte Jóven. J.A.T. and M.M.B. are funded by the official funding agency for biomedical research of the Spanish government, the Institute of Health Carlos III (ISCIII), which is co-funded by the European Regional Development Fund (CIBEROBN CB12/03/30038).

The online version contains supplementary material available at https://doi.org/10.1186/s12966-021-01169-w Additional file 1 Supplementary Table 1.Characteristics of the validation study participants and the remaining participants of the population-based PASOS cohort. Additional file 2 Supplementary Table 2.Correlation coefficients and between-method agreement of moderate to vigorous physical activity measurements derived by the Physical Activity Unit 7-item screener, non-calibrated and calibrated, and the reference method (accelerometer),stratified by age ; [Abstract] Background Validation of self-reported tools, such as physical activity (PA) questionnaires, is crucial. The aim of this study was to determine test-retest reliability, internal consistency, and the concurrent, construct, and predictive validity of the short semi-quantitative Physical Activity Unit 7 item Screener (PAU-7S), using accelerometry as the reference measurement. The effect of linear calibration on PAU-7S validity was tested. Methods A randomized sample of 321 healthy children aged 8–16 years (149 boys, 172 girls) from the nationwide representative PASOS study completed the PAU-7S before and after wearing an accelerometer for at least 7 consecutive days. Weight, height, and waist circumference were measured. Cronbach alpha was calculated for internal consistency. Test-retest reliability was determined by intra-class correlation (ICC). Concurrent validity was assessed by ICC and Spearman correlation coefficient between moderate to vigorous PA (MVPA) derived by the PAU-7S and by accelerometer. Concordance between both methods was analyzed by absolute agreement, weighted kappa, and Bland-Altman statistics. Multiple linear regression models were fitted for construct validity and predictive validity was determined by leave-one-out cross-validation. Results The PAU-7S overestimated MVPA by 18%, compared to accelerometers (106.5 ± 77.0 vs 95.2 ± 33.2 min/day, respectively). A Cronbach alpha of 0.76 showed an acceptable internal consistency of the PAU-7S. Test-retest reliability was good (ICC 0.71 p < 0.001). Spearman correlation and ICC coefficients of MVPA derived by the PAU-7S and accelerometers increased from 0.31 to 0.62 and 0.20 to 0.62, respectively, after calibration of the PAU-7S. Between-methods concordance improved from a weighted kappa of 0.24 to 0.50 after calibration. A slight reduction in ICC, from 0.62 to 0.60, yielded good predictive validity. Multiple linear regression models showed an inverse association of MVPA with standardized body mass index (β − 0.162; p < 0.077) and waist to height ratio (β − 0.010; p < 0.014). All validity dimensions were somewhat stronger in boys compared to girls. Conclusion The PAU-7S shows a good test-retest reliability and acceptable internal consistency. All dimensions of validity increased from poor/fair to moderate/good after calibration. The PAU-7S is a valid instrument for measuring MVPA in children and adolescents. ; PASOS study has been funded mainly by Fundación PROBITAS and Gasol Foundation. Additional funds were received from the Barça Foundation, Banco Santander, Grupo IFA, Viena and Fundación Deporte Jóven, grant of support to research groups number 35/2011 (Balearic Islands Gov) and EU COST Action CA16112. J.A.T. and M.M.B. are funded by the official funding agency for biomedical research of the Spanish government, Institute of Health Carlos III (ISCIII), which is cofunded by the 333 European Regional Development Fund (CIBEROBN CB12/03/30038). PASOS has the institutional support of Spain's Ministry of Education and Vocational Training, the Ministry of Health, Consumption and Social Welfare through the Spanish Agency for Food Safety and Nutrition (ASEAN), the High Commission against Child Poverty, the High Sports Council, the General College of Professional Associations of Physical Education and Sports, and the Departments of Education and/or Health and/or Sports of Spain's 17 autonomous regions. The CIBERESP and the CIBEROBN are initiatives of the Institute of Health Carlos III, Madrid, Spain. ; Gobierno de las Islas Baleares; 35/2011 ; European Cooperation in Science and Technology; CA16112

The aim of this study is to evaluate if screen time and parents' education levels are associated with adherence to a Mediterranean dietary pattern. This cross-sectional study analyzed a representative sample of 3333 children and adolescents (8 to 16 years) included in the Physical Activity, Sedentarism, lifestyles and Obesity in Spanish youth (PASOS) study in Spain (which ran from March 2019 to February 2020). Data on screen time (television, computer, video games, and mobile phone) per day, Mediterranean diet adherence, daily moderate or vigorous physical activity, and parents' education levels were gathered using questionnaires. A descriptive study of the variables according to sex and parents' education level was performed. Logistic regression models (adjusted by sex and weight status) were fitted to evaluate the independent association between screen time and Kids' level of adherence to the Mediterranean diet (KIDMED) index, as well as some of its items. A greater amount of screen time was associated with worse adherence to the Mediterranean diet; a lower consumption of fruit, vegetables, fish, legumes, and nuts; and a greater consumption of fast food, sweets, and candies. A lower parents' education level was associated with worse adherence to the Mediterranean diet. It is necessary to promote the responsible, limited use of screen time, especially in children with parents with a lower education level. ; The PASOS study was funded by Fundación PROBITAS and the Gasol Foundation. Additional funds were received from the Barça Foundation, Banco Santander, IFA, Vienna and the Fundación Deporte Jóven. J.A.T. and M.M.B. are funded by the official funding agency for biomedical research of the Spanish government, the Institute of Health Carlos III (ISCIII), which is co-funded by the European Regional Development Fund (CIBEROBN CB12/03/30038).

Background: Validation of self-reported tools, such as physical activity (PA) questionnaires, is crucial. The aim of this study was to determine test-retest reliability, internal consistency, and the concurrent, construct, and predictive validity of the short semi-quantitative Physical Activity Unit 7 item Screener (PAU-7S), using accelerometry as the reference measurement. The effect of linear calibration on PAU-7S validity was tested. Methods: A randomized sample of 321 healthy children aged 8–16 years (149 boys, 172 girls) from the nationwide representative PASOS study completed the PAU-7S before and after wearing an accelerometer for at least 7 consecutive days. Weight, height, and waist circumference were measured. Cronbach alpha was calculated for internal consistency. Test-retest reliability was determined by intra-class correlation (ICC). Concurrent validity was assessed by ICC and Spearman correlation coefficient between moderate to vigorous PA (MVPA) derived by the PAU-7S and by accelerometer. Concordance between both methods was analyzed by absolute agreement, weighted kappa, and Bland-Altman statistics. Multiple linear regression models were fitted for construct validity and predictive validity was determined by leave-one-out cross-validation. ; PASOS study has been funded mainly by Fundación PROBITAS and Gasol Foundation. Additional funds were received from the Barça Foundation, Banco Santander, Grupo IFA, Viena and Fundación Deporte Jóven, grant of support to research groups number 35/2011 (Balearic Islands Gov) and EU COST Action CA16112. J.A.T. and M.M.B. are funded by the official funding agency for biomedical research of the Spanish government, Institute of Health Carlos III (ISCIII), which is cofunded by the 333 European Regional Development Fund (CIBEROBN CB12/03/30038). PASOS has the institutional support of Spain's Ministry of Education and Vocational Training, the Ministry of Health, Consumption and Social Welfare through the Spanish Agency for Food Safety and Nutrition (ASEAN), the High Commission against Child Poverty, the High Sports Council, the General College of Professional Associations of Physical Education and Sports, and the Departments of Education and/or Health and/or Sports of Spain's 17 autonomous regions. The CIBERESP and the CIBEROBN are initiatives of the Institute of Health Carlos III, Madrid, Spain.