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1. **Title:** Effectiveness of Filtering in GALI Questionnaire Design 2. **Summary:** The study examines the impact of

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1. **Title:** Effectiveness of Filtering in GALI Questionnaire Design 2. **Summary:** The study examines the impact of

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  1. 1 Effect of filters in health related questions Standardization of questionnaire design Lotte Rustad Thorsen Statistics Norway 1

  2. Background • Statistics on Income and Living Conditions (EU-SILC) • Seven health-related variables. • Limitations in activities because of health issues (GALI) • The GALI indicator consists of the following four concepts: i) being limited ii) in activities people usually do iii) because of health problems and iiii) for at least the past 6 months. 2

  3. GALI in The Norwegian EU-SILC • The health questions related to the GALI indicator have been divided in several questions (since 2003) • Use of the question on health problems and chronic conditions as a screening question to the GALI questions. • Only respondents who state that they have long term health problems or disabilities will get the follow-up question on limitations in activities people usually do. 3

  4. The standard wording of the GALI For at least the past 6 months, to what extent have you been limited because of a health problem in activities people usually do? Would you say you have been… 1. Severely limited 2. Limited but not severely, or 3. Not limited at all? In developing the GALI instrument it has been recommended that the question should not be preceded by a screening question on health problems to avoid selection 4

  5. Testing screening of GALI • Work done in the EU regarding harmonization of health variables (between surveys and countries) • In line with this there was conducted an experiment in the data collection in the 2011 operation of the Norwegian SILC • To test the effect of screening leading up to the GALI question the sample was divided in two groups, an experimental group and a control group. 5

  6. Control group Experimental group • Filtering of the GALI questions • Only the respondents who suffered from chronic health problems where exposed to the GALI questions (42 %) • No filtering of The GALI questions • All the respondents exposed to GALI questions • Old sample • New sample • Objective question • Subjective question 6

  7. Net samples by different background characteristics. EU-SILC Norway 2011. Percent 0 10 20 30 40 50 60 70 80 Females Males 16-24 years 25-44 years 45-66 years 67 years and older Control group Experimental group Below upper secondary level Upper secondary level Tertiary education Single household Not single household Very good and good health Fair health Bad and very bad health 7

  8. Limitations in activities because of health problems. EU-SILC Norway 2011. Percent 100 90 80 70 60 50 40 Control group Experimental group 30 20 10 0 8

  9. Experimental group. EU-SILC Norway 2011. Percent Limitations in activities because of health problems Yes No Suffer from any chronic illness or condition 55 45 Yes 2 98 No Control group. EU-SILC Norway 2011. Percent Limitations in activities because of health problems Yes No Suffer from any chronic illness or condition 50 50 Yes - - No 9

  10. Correlation between whether you have limitations in activities because of health problems and various background factors. Logistic regression. Odds ratios. EU-SILC Norway 2011. N = 4 687 Odds Ratio Estimate Pr>Chi- Square 0.0108 0.805 Control group (ref: Experimental group) Sex (ref: Males) Females 1.615 <.0001 Age (ref: 15-24 years) 25-44 years 45-66 years 67 years and older 1.566 1.870 1.724 0.4509 <.0001 0.0337 Education (ref: Tertiary education) Below upper secondary level Upper secondary level 1.778 1.372 <.0001 0.0017 1.223 0.0060 Single household (ref: Not single household) Self-perceived health (ref: Very good and good health) Fair health Bad and very bad health 7.577 70.862 0.1898 <.0001 10

  11. Correlation between whether you have limitations in activities because of health problems and various background factors. Logistic regression. Odds ratios. EU-SILC Norway 2011. N = 4 678 Odds Ratio Estimate Pr>Chi-Square 0.860 0.0803 Q2 (ref: Q1) Sex (ref: Males) Females 1.613 <.0001 Age (ref: 15-24 years) 25-44 years 45-66 years 67 years and older 1.535 1.828 1.679 0.4803 <.0001 0.0483 Education (ref: Tertiary education) Below upper secondary level Upper secondary level 1.781 1.355 <.0001 0.0012 1.217 0.0077 Single household (ref: Not single household) Self-perceived health (ref: Very good and good health) Fair health Bad and very bad health 7.609 71.979 0.1759 <.0001 11

  12. Concluding remarks • When there is no filtering of the GALI question only a small percentage (2 percent) of the respondents who do not suffer from chronic illness or condition report that they have limitations in activities because of health issues. • Filtering of the GALI question has a significant importance for the likelihood of having limitations in activities because of health issues. • The different question formulations in itself did not have a significant impact (.95) on the probability to have limitations because of health issues. • If the GALI questions are asked without filtering, this analysis indicate that the share with limitations will be slightly higher compared to now. 12

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