P09-04 Sedentary time measured by GT3X+ accelerometry and its variation with grade level and gender among children and adolescents in Morocco

Abstract 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 ± 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 ± 87.15 min/day or ∼ 62.94% of the average daily accelerometer wear time of 851.45 ±51.35.min/day with statistical differences between weekend and week days (471.357 ± 127.73 minutes/day vs. 559.7661± 90.75 minutes/day; p > 0.001). Adolescents (11-14y) were more involved in sitting tasks when compared to the early grades (8-10y). 550.011±88.827 vs. 521.845±83.602 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. Acknowledgements This study was performed with the support of the International Atomic Energy Agency (CRP E4.30.24; RAF 6042).


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 diseases represent a high economic burden for the French health system. To address this issue, strong responses should 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.

Objectives
To determine whether or not, and, what extent the association between sedentary time, moderate to vogorous physical activity and self-care disability.

Methods
Sedentary time was measured with accelerometers. Self-care followed by sitting at work and other activities (both 1.7 hour/day). Significant differences (p > 0.001) were found by sex, age group and level of education. Men reported slightly more sedentary hours than women (9.2 vs. 8.8 hours/day). With respect to age groups, adolescents (12-17 years old) reported the highest, whereas children (4-11 years old) reported the lowest sedentary hours (10.1 vs. 7.3 hours/day). Finally, sedentary hours were high for higher educated people (9.7 vs. 8.2 hours/day in lower educated people). Adolescents accumulated most sedentary time at school or during studying (4.0 hours/day), higher educated people accumulated most sedentary time at work (3.4 hours/day).

Conclusions
Our study showed that in general Dutch people spend a lot of time sedentarily, especially adolescents and higher educated people. Most sedentary times was spent while watching television, at school or during studying, and at work. Therefore interventions aiming to decrease sedentary behaviour in the home environment, the occupational as well as the