P09-02 Risks assessment related to physical activity and sedentary lifestyle profiles among French children and adolescents

Abstract Introduction Based on Anses's report (2016)[1][1], the French Public Health Policy emphasizes on health status improvement by acting on physical activity and sedentary behaviors. Since 2016, many countries have collected results of large epidemiological studies providing new insights into the effect of physical activity- and mainly sedentary-related behaviors on health. To date, behaviors inducing the highest risks are not identified. In this context, based on the data from the most recent French Food Consumption Survey “(Inca3 2017)”[1][2], Anses aims at characterizing the overweight and obesity risks related to physical fitness regarding the levels of physical activity (PA) and sedentary (SED) daily duration of children and adolescents. Methods For 11–17 year-old children, the PA and SED behavior were collected using an adapted Youth Risk Behavior Survey questionnaire. Physical activity and sedentary duration were compared to the thresholds considered as safe (Anses 2016): PA > 60 min/day and SED 20 min/day and SED >4h30/day) were set to disaggregate the population that does not reach these benchmarks, allowing to define nine profiles regarding the associated risks identified and updated in the literature. Profiles were compared according to BMI and age using Pearson chi-square tests. All statistical analysis were performed taking into account the survey complex sampling frame design and the individual weighting. Results The preliminary results show nine risk-based profiles of children and adolescents (n = 1285) related to the risk thresholds that can be identified. The most at risk profiles represented almost 50% of the 11-17 years old and were associated with the highest BMI. The highest sedentary (>4h30) profiles were observed in the oldest adolescents. However, among them, regarding the updated literature, those having a high physical activity level were considered as at lower risk. Conclusion Finally, definition of profiles based on risk thresholds, >60 min/day and >20 min/day for PA and allows to characterize the children and adolescents the most a risk in order to enhance the effectiveness of public health policy. The risk assessment could be further refined using accelerometer real time measurement of physical activity and sedentary behavior.


Background
Rising levels of childhood obesity is a worldwide concern, with physical inactivity considered to be amongst the many contributors. Worryingly, physical activity (PA) tends to decline throughout adolescence. Although there is extensive research on the sociodemographic disparities of adolescent PA participation, less evidence is available on the potential involvement of immigration status in such disparities. The aim of this study was to investigate PA levels according to migration status among adolescents aged 12-20 years in Belgium.

Methods
This study used the data from the cross-sectional 2018 Health Behaviour in School-aged Children (HBSC) survey in Frenchspeaking Belgian schools (Brussels and Wallonia). A two-stage random sample was used to select participants. Data was collected using self-administrated questionnaires. Adolescents aged 12 to 20 were included in the analyses presented here (n = 8635, boys: n = 4179, girls: n = 4456). The association of global PA (GPA) and vigorous PA (VPA) with migration status (natives, 2nd and 1st-generation immigrants) was analysed using multiple binary logistic regression analyses. Interactions with gender were tested.

Conclusions
This study shows disparities in PA participation according to migration status and gender, independently of sociodemographic characteristics, for adolescents living in French-speaking Belgium. These findings will enable to inform future public health initiatives promoting PA in adolescents on migration

Background
The health benefits of a physically active lifestyle adolescence include improved muscular fitness, bone cardiometabolic health, and positive effects on weight. Physical activity has also a positive impact on cognitive development and socializing. Trends show a decline in its practice, especially in developing countries. As the potential related-factors of physical activity are not commonly assessed in Ivorian youth, we investigated factors associated with physical activity among schoolchildren in Abidjan. Methods A cross-sectional study was carried out in a random sample of 394 schoolchildren aged 11-20 years in 2019, in Abidjan, Southern Cô te d'Ivoire. Moderate-to-vigorous physical activity was assessed using a questionnaire based on Youth Risk Behaviour Surveillance System (YRBSS). Height and weight were objectively measured and body mass index (BMI) was calculated. Demographic and socioeconomic characteristics and dietary factors were also collected. Chi square test was used to compare proportions.

Results
The majority of children (71.3%) do not achieve the daily recommended duration of physical activity (at least 60 minutes/day). Walking to school (80.4%) was the most common physical activity. Schoolchildren that were male (p = 0.039), had normal BMI (p = 0.04), consumed water during meals (p = 0.000) were the more physically active. The others factors that increase physical activity in our population were physically active mothers (p = 0.037) and the presence of

Methods
For 11-17 year-old children, the PA and SED behavior were collected using an adapted Youth Risk Behavior Survey questionnaire. Physical activity and sedentary duration were compared to the thresholds considered as safe (Anses 2016): PA > 60 min/day and SED 20 min/day and SED >4h30/day) were set to disaggregate the population that does not reach these benchmarks, allowing to define nine profiles regarding the associated risks identified and updated in the literature. Profiles were compared according to BMI and age using Pearson chi-square tests. All statistical analysis were performed taking into account the survey complex sampling frame design and the individual weighting.

Results
The preliminary results show nine risk-based profiles of children and adolescents (n = 1285) related to the risk thresholds that can be identified. The most at risk profiles represented almost 50% of the 11-17 years old and were associated with the highest BMI. The highest sedentary (>4h30) profiles were observed in the oldest adolescents. However, among them, regarding the updated literature, those having a high physical activity level were considered as at lower risk.

Conclusion
Finally, definition of profiles based on risk thresholds, >60 min/day and >20 min/day for PA and allows to characterize the children and adolescents the most a risk in order to enhance the effectiveness of public health policy. The risk assessment could be further refined using accelerometer real time measurement of physical activity and sedentary behavior. Keywords: prevention, risk threshold, behavior

Background
There is strong evidence showing that sedentary behaviour (SB) increase the risk to develop several chronic diseases and to premature death (Chau et al., 2015). A dose response relation is observed with a more marked risk when people spend more than 7 hours/day in sitting position (Ekelund et al., 2019). The study INCA 3 on the lifestyle habits of French population indicated that 40% of people between 18 and 79 years had a high risk for health conditions with more than 7 hours of daily SB (ANSES, 2017). The economic consequences of this risk have never been evaluated. The aim of this study was to estimate the economic burden of SB-related diseases in France. Methods From meta-analysis or large cohorts based on individual SB time, we identified relative risk (RR) to develop cardiovascular disease (CVD), colon cancer, breast cancer and all-causes premature death after co-variables adjustments including physical activity. From RR and prevalence of SB time in France, a population attributable fraction approach was used to estimate the yearly number of cases for each disease. Data from the national health insurance were used to calculate the annual average costs per case for each disease. Then, disease-specific and total health-care costs attributable to prolonged SB time were calculated. Indirect costs for private sector and households were calculated in a second stage.

Results
In France, 66 528 premature deaths/year appear related to a daily SB time ! 8,6 hours Each year prolonged SB cost 559 millions E for the national health insurance, including 359 millions E for CVD (! 10 hours of daily SB), 170 millions E for breast cancer (! 6 hours of daily SB), and 31 millions E for colon cancer (! 5 hours of TV/day).

Conclusions
These preliminary results showed that many deaths could be avoided by reducing prolonged SB prevalence in France. Moreover, direct health-care costs attributable to SB related Abstract citation ID: ckac095.134 P09-04 Sedentary time measured by GT3X+ accelerometry and its variation with grade level and gender among children and adolescents in Morocco

Background
Sedentary behavior (SB) in children is related to different health outcomes such as overweight and cardio-metabolic diseases. These negative effects have been widely supported by evidence. However, no data on sedentary time (ST) among Moroccan children has been available, yet. Therefore, the present study examined gender and grade differences in objectively measured sedentary behavior in a sample of Moroccan primary school children and adolescents.

Methods
In total, 172 Moroccan children/adolescents aged between 8 to 14 years old (mean age = 10.92 AE 1.55 years; 49.4% were boys) completed the survey. School grade, gender, height, and weight were collected by questionnaires and ST objectively measured using a tri-axial accelerometer (GTX3+). Study required at least 3 valid weekdays and 1 weekend day with? 600 min/day total wear time. Two-way analysis of covariance and logistic regression analyses, adjusted for BMI z-score and accelerometer wear time, were used to examine gender and grade differences in ST.

Results
Mean time spent in SB was 535.93 AE 87.15 min/day or $ 62.94% of the average daily accelerometer wear time of 851.45 AE51.35.min/day with statistical differences between weekend and week days (471.357 AE 127.73 minutes/day vs. 559.7661AE 90.75 minutes/day; p > 0.001). Adolescents (11-14y) were more involved in sitting tasks when compared to the early grades (8-10y). 550.011AE88.827 vs. 521.845AE83.602 respectively; p > 0.001. Conclusion ST increases between ages 11 and 14 years. On week days children and adolescents spent sitting longer than at weekends. Girls and adolescents were identified as potential risk groups. This report on ST presents valuable information for designing and implementing interventions to decrease time spent in SB among children during class time.