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Canadian Health Measures Survey (CHMS) Data User Guide: Cycle 2

Table of contents

1. Introduction

2. Important notes related to this document

2.1 Acronyms and abbreviations
2.2 References and end notes
2.3 Survey documentation
2.4 Updates to CHMS documentation

2.4.1 User guide
2.4.2 Data files

3. Canadian Health Measures Survey (CHMS) background and objectives

3.1 CHMS background
3.2 CHMS objectives

4. Survey approval

4.1 Authority
4.2 Ethical protocols and privacy standards

5. Survey content

6. Sample design

6.1 Target population
6.2 Sample size and allocation
6.3 Sampling frames and sampling strategy

6.3.1 Sampling of collection sites
6.3.2 Dwelling sampling
6.3.3 Respondent sampling
6.3.4 Activity monitor and indoor air sampler subsamples
6.3.5 Blood and urine subsamples Fasted subsampling Environmental blood subsampling Environmental urine subsampling

7. Data collection

7.1 Preparation for collection

7.1.1 The Canadian Health Measures Survey (CHMS) team Field team Mobile Examination Centre (MEC) team Head office staff

7.1.2 The Mobile Examination Centre (MEC)
7.1.3 Informatics environment
7.1.4 Questionnaire design Household questionnaire MEC questionnaire Indoor air questions Fish and shellfish consumption Grooming products

7.2 Collection

7.2.1 Collection – Household interview
7.2.2 Collection – MEC
7.2.3 Collection – Home visit

7.3 Minimizing non-response

7.3.1 Minimizing non-response – Household interview Introductory material Initiating contact Refusal procedures Language barriers Youth respondents Proxy interviews

7.3.2 Minimizing non-response – MEC Non-response follow-up Flexible MEC hours Refusal procedures Language barriers Youth respondents

7.4 Physical measures protocols - MEC

7.4.1 Anthropometry Standing height Sitting height Weight Waist circumference Hip circumference Neck circumference Skinfolds

7.4.2 Heart rate and blood pressure
7.4.3 Spirometry
7.4.4 Musculoskeletal fitness Grip strength component Sit and reach component Partial curl-up component Modified Canadian Aerobic Fitness Test (mCAFT) component

7.4.5 Activity monitor

7.5 Indoor air sampler protocol

7.6 Laboratory measures protocols

7.6.1 Sample collection Blood collection Urine collection

7.6.2 Analysis of CBC performed at the Mobile Examination Centre (MEC)
7.6.3 Processing and storage of the blood and urine samples
7.6.4 Shipment of the blood and urine samples

8. Data processing

8.1 Verification
8.2 Mark-all-that-apply questions
8.3 Coding
8.4 Editing
8.5 Creation of derived variables
8.6 Analytical range

9. Weighting

9.1 Selection weights for collection sites
9.2 Selection weights for dwellings
9.3 Removal of out-of-scope units
9.4 Household non-response
9.5 Creation of the person weight
9.6 Non-response at the questionnaire level
9.7 Non-response at the MEC level
9.8 Winsorization
9.9 Calibration
9.10 Bootstrap weights
9.11 Weighting for selected subsamples

9.11.1 Weighting for activity monitor data
9.11.2 Weighting for indoor air sampler data Household-level weights Person-level weights

9.11.3 Weighting for blood and urine data Weighting for fasted subsample Weighting for environmental blood and urine subsamples

10. Data quality

10.1 Response rates

10.1.1 Household and MEC response rates
10.1.2 Activity monitor response rates
10.1.3 Indoor air sampler response rates
10.1.4 Blood draw and urine response rates
10.1.5 Response rates for blood and urine subsamples Fasted subsample response rates Environmental blood subsample response rates Environmental urine subsample response rates

10.2 Errors in surveys

10.2.1 Non-sampling errors
10.2.2 Sampling errors

10.3 Quality assurance and control

10.3.1 Training of household interviewers and Mobile Examination Centre (MEC) staff Initial training Dress rehearsal Ongoing training – Dry run day Annual retraining

10.3.2 Household component Monitoring – Household interview Household questionnaire response rates Validation of questionnaire responses

10.3.3 Mobile Examination Centre (MEC) component Equipment selection Protocols and procedures Mobile Examination Centre (MEC) environment Adherence to pre-testing guidelines Equipment monitoring Data entry verification Spirometry data review Data validation Activity monitor data review Indoor Air Sampler (IAS) duplicates Replicate testing Mobile Examination Centre (MEC) laboratory Proficiency testing Processing and storage of the blood and urine samples Shipping Blanks

10.3.4 Head office Correcting for bias Indoor air data Insulin data Red blood cell folate data Human Papillomavirus (HPV) data

11. File usage

11.1 Description of data files

11.1.1 Master file (wave 1)
11.1.2 Medication file Naming convention for medication variables Description of key medication variables

11.1.3 Postal code file
11.1.4 Climate and air quality file
11.1.5 Master file (wave 2)
11.1.6 Activity monitor subsample file
11.1.7 Indoor air subsample file – Household level
11.1.8 Indoor air subsample file – Person level
11.1.9 Fasted subsample file
11.1.10 Final master file (wave 3)
11.1.11 Environmental blood subsample file
11.1.12 Environmental urine subsample file

11.2 Key variables for linking data files
11.3 Key variables and definitions
11.4 Use of age and sex variables
11.5 Use of weight variables
11.6 Variable naming convention

11.6.1 Position 4: place holder or variable type
11.6.2 Positions 5-8: question reference

11.7 Access to data files

12. Guidelines for tabulation, analysis and release

12.1 Guidelines for tabulation

12.1.1 Tabulation of categorical and quantitative estimates Categorical estimates Quantitative estimates

12.1.2 Imputation of household income
12.1.3 Other missing data and values below the limit of detection

12.2 Guidelines for statistical analysis

12.2.1 Precise variances or coefficients of variation
12.2.2 Some recommendations for doing analysis with data from cycle 2 of the CHMS
12.2.3 Data comparability over time Normative scales Activity monitor data for 3 to 5 year olds Phthalate data Glucose data Insulin data Microalbumin data Creatinine data Limits of detection Significant digits Combining data from cycles 1 and 2

12.2.4 Tabulations of environmental blood subsample data

12.2.5 Software packages available

12.3 Guidelines for releasing data

12.3.1 Sample size and coefficient of variation
12.3.2 Rounding guidelines

13. References and end notes

Appendix 1 - Acronyms and abbreviations
Appendix 2 - List of available Canadian Health Measures Survey (CHMS) documents
Appendix 3 - List of collection sites for cycle 2
Appendix 4 - Pre-testing guidelines
Appendix 5 - Exclusion criteria
Appendix 6 - Physical activity readiness questionnaire (PAR-Q)
Appendix 7 - Medication classification systems
Appendix 8 - Response rates
Appendix 8A - CHMS cycle 2 response rates by age group and sex
Appendix 8B - CHMS cycle 2 activity monitor response rates by age group and sex
Appendix 8C - CHMS cycle 2 indoor air sampler (IAS) response rates
Appendix 8D - CHMS cycle 2 blood draw and urine response rates by age group and sex
Appendix 8E - CHMS cycle 2 fasted subsample response rates by age group and sex
Appendix 8F - CHMS cycle 2 environmental blood subsample response rates by age group and sex
Appendix 8G - CHMS cycle 2 environmental urine subsample response rates by age group and sex
Appendix 9 - Activity monitor research

Appendix 10 - Changes to wave 1 variables