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Deanna E. White, Adam Stevens, John Barbaro, Kristy McGill and Lynne Russell
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What is RRFSS
Rapid Risk Factor SurveillanceSystem
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Key Public Health Issues Able to Monitor
Family History
Obesity
Hypertension
Diabetes
Smoking
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to New Public Health Issues Adaptable
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Local
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Timely
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How Can We Use RRFSS?
• To support program planning and evaluation
• To advocate for public policy development
• To improve community awareness of risks for CDs, IDs and injuries
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Who Can Join RRFSS?
Any Public Health Unit in Ontario
… but thereis a cost.
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When is the Survey Conducted?
• There are three 4-month data cyclesper year.
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How is Data Collected
• Institute for Social Research (ISR) at York University
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How Long is the Survey?
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How is the Questionnaire Organized?
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• Decided annually by all participating HUs
• Asked for at least one year
• May rotate alternating years
• Mandatory – CANNOT opt out of these
AGE SEX BMI TOBACCOUSE INCOME
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• Selected by each HU individually
• Can add or delete each cycle
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What are some of the Topics/Modules?
See QMap
Your Turn!Are there any topics you would be interested in? Please circle the topic.
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Must We Use the Entire Module?
But …• Must start at the beginning
of a module
• Cannot jump back in once stopped
No
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Can We Develop Modules?
Yesbut you must followa process:• Complete Module Submission
Request Form
• Should be applicable to multiple PHUs
• Can work with your own if no other PHU interested
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How to Choose Optional
• Align with health unit’s data needs
• Measure the variable over time(decrease in chronic disease prevalence?)
• Data is not available from other data sources(use and awareness of parenting programs)
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What is the Sample Size?
400 3 1,200interviews/HU cycles/year interviews/year
RRFSS has a larger sample size than the CCHS in some PHUs.
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Who is Included in the Sample?
• 18 years of age and older
• English or French speaking
• Reside in private homes
• With landline
* some cell phone numbers were included
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Is the Sample Size Big Enough?
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Sampling Procedures
• Random selection of households – using random digit dialing
• Random selection of respondent – household member with next birthday
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Household Weights
• Maximize ability to generalize the survey results (the sample) to the population
• Probability of selection depends on size of household
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Household Weights
Size ofHousehold
ChanceSelected
Weight
1adult
2adults
3adults
100% Given weight of 1
50% Given weight of 2
33.3% Given weight of 3
This helps to prevent under-representation in larger households and over-representation in small households.
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Calculations were used to determine sample size for results to be generalizable
So, is it Still Representative?
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Is the Survey Valid & Reliable?
• Modeled on the Behavioural Risk Factor Surveillance System (BRFSS) conducted by the Centres for Disease Control and Prevention (CDC) in Atlanta
• Many questions also taken from the CCHS and the National Population Health Survey (NPHS)
• The original design was tested for reliability and validity
Yes!
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How Do We Ensure Accurate Results?
• Confidence intervals & coefficient of variation
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The Confidence Interval (CI)
• How confident are we in the point estimate (i.e., value)?
• E.g., 6% … (85% CI: 3% - 9%). What does 95% mean?
• … based on probability.
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Probability
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Probability
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Probability
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Significance Testing
Statistically Significant
NOT Statistically Significant
What does this have to do with the CI?
• Likely happened• The results are probable
• It could have happened by chance alone
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Significance Testing
Your Turn!Please complete section one. Circle statistically significant statements.
• We use the CI to determine whether something is statistically significant.
• If the CIs do not overlap than they are SS
• Example: Percentage of females vs males who smoke:Females: 70% (60%-80%)Males: 30% (20%-40%)
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Coefficient of Variation
Your Turn!Please circle the asterisk
in the table.
• Refers to the precision of the estimate
• Usually a result of small numbers (i.e., 2/800)
• Interpret with caution presented with an *asterisk
• An empty cell means the value is not precise(in fact, incorrect), so we cannotreport this number
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RRFSS is Self-Reported? Are there limitations to this?
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Distorted Perceptions
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Distorted Perceptions
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Hawthorne Effect
In groups of two, please answer the following …
How many times per day, week or month do you drink 100% fruit juices such as orange, grapefruit, or tomato juice?
How often do YOU wear a seatbelt when YOU DRIVE a car, van or truck: Would you say, all of the time, most of the time, about 1/2 the time, less than 1/2 the time, or never or almost never?
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Memory Recall
What is the total amount of time you spent sitting, last Wednesday? (hours & minutes)
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Sensitivity
In groups of two, please answer the following …
What is your age?
How much do you weigh?
In your lifetime, have youEver had suicidal thoughts?
What is your yearly totalIncome (before taxes)?
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Self-Reported Measures
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What RRFSS Recall