Blood pressure of Canadian children and youth, 2009 to 2011
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Among Canadian children and youth, 96% have a measured blood pressure that is considered normal, while the remaining 4% have a measured blood pressure that is considered borderline or elevated. Blood pressure is generally higher among overweight and obese children and youth.
The average resting blood pressure is 94/61 mmHg for Canadian children aged 6 to 11 years and 98/62 mmHg for Canadian youth aged 12 to 19 years based on directly measured blood pressure results from the 2009 to 2011 Canadian Health Measures Survey (CHMS).
Overall, 96% of children and youth have a blood pressure that is considered normal, while the remaining 4% have a measured blood pressure that is considered borderline or elevated (Chart 1) according to the criteria of the National High Blood Pressure Education Program Working Group on High Blood Pressure in Children and Adolescents and the Joint National Committee on Prevention, Detection and Treatment of High Blood Pressure.Note 1, Note 2 Boys were no more likely than girls to have borderline or elevated blood pressure.
Chart 1
Distribution of household population aged 6 to 19, by blood pressure classification, sex and age group, Canada, 2009 to 2011
Blood pressure and body composition
Children and adolescents with higher body mass index tend to have higher systolic blood pressure (SBP) (Chart 2). Average SBP was significantly higher in overweight and obese children aged 6 to 11, and in obese adolescents aged 12 to 19, when compared to their normal weight counterparts. Differences in diastolic blood pressure (DBP) were not as strong; only overweight boys aged 6 to 11 had a significantly higher DBP compared to those of normal weight.
Chart 2
Average systolic blood pressure, by body mass index classification,† age group and sex, household population aged 6 to 19, Canada, 2009 to 2011
About blood pressure
Blood pressure (BP) is a measure of the force of blood against the artery walls, and is expressed as systolic pressure (SBP)/diastolic pressure (DBP) in millimetres of mercury (e.g., 120/80 mmHg). The systolic pressure (top number) is the pressure when the heart contracts and pushes the blood out and the diastolic pressure (bottom number) is the lowest pressure when the heart relaxes between beats.
Blood pressure has many implications for health. High systolic blood pressure and/or high diastolic blood pressure can cause damage to the blood vessels and can result in heart attack or stroke, which are leading causes of hospitalization and death in Canada. Elevated blood pressure in childhood is a risk factor for the development of hypertension in adulthood, and is more likely in those with elevated body mass index.
Ages 6 to 17Note 1 | Ages 18 and 19Note 2 | |
---|---|---|
Normal | SBP and DBP < 90th percentile | Mean SBP/DBP < 120/80 mmHg |
Borderline |
SBP or DBP ≥ to the 90th percentile, but < the 95th percentile OR Measured mean SBP/DBP > 120/80 mmHg |
Mean SBP of 120-139 mmHg and mean DBP of 80-89 mmHg OR Mean SBP of 120-139 mmHg and mean DBP < 80 mmHg OR Mean SBP < 120 mmHg and mean DBP of 80-89 mmHg |
Elevated |
SBP or DBP ≥ 95th percentile OR Respondent reported using BP medication within the past month |
Mean SBP/DBP of ≥ 140/90 mmHg OR Respondent reported using BP medication within the past month |
References
- National High Blood Pressure Education Program Working Group on High Blood Pressure in Children and Adolescents. The fourth report on the diagnosis, evaluation, and treatment of high blood pressure in children and adolescents. Pediatrics. 2004;114(2 Suppl. 4th report):555-76.
- Chobanian AV, Bakris GL, Black HR, et al. Seventh report on the Joint National Comittee on the Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. Hypertension. 2003;42(6):1206-52.
- de Onis M, Onyango AW, Borghi E, Siyam A, Nishida C, Siekmann J. Development of a WHO growth reference for school-aged children and adolescents. Bulletin of the World Health Organization. 2007;85(9):660-7.
For more information on the Canadian Health Measures Survey, please contact Statistics Canada's National Contact Centre (toll-free 1-800-263-1136; 613-951-8116; infostats@statcan.gc.ca).
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