In a recent study, young adults (18-25 years) were randomly assigned to one of two treatments to increase seat belt use. The intervention group received Safe Vehicle Engagement (SAVE) intervention, a 6-week automated interactive text message program, including weekly seat belt use queries with feedback and goal support to increase seat belt use. The control group received similar queries but no additional feedback. The primary objective is to assess whether there is an association between treatment (SAVE vs control) and self-report of always using a seat belt over the past 2 weeks at the 6-week follow-up. Below is the 2x2 table of treatment and primary endpoint. Always wearing a seat belt Not always wearing a seat belt SAVE Intervention 34 48 Control 15 61 Questions: (1) Estimate an appropriate absolute measure of association and 95% confidence interval (CI) comparing participants who received SAVE intervention to those who received control treatment. Be sure to interpret. (2) Estimate an appropriate relative measure of association and 95% confidence interval (CI) comparing participants who received SAVE to those who received control treatment. Be sure to interpret. (3) Based on the CI in part d., what can we conclude about the relationship between SAVE intervention and always using a seat belt? Be sure to justify your answer
In a recent study, young adults (18-25 years) were randomly assigned to one of two treatments to increase seat belt use. The intervention group received Safe Vehicle Engagement (SAVE) intervention, a 6-week automated interactive text message program, including weekly seat belt use queries with feedback and goal support to increase seat belt use. The control group received similar queries but no additional feedback.
The primary objective is to assess whether there is an association between treatment (SAVE vs control) and self-report of always using a seat belt over the past 2 weeks at the 6-week follow-up. Below is the 2x2 table of treatment and primary endpoint.
|
|
Always wearing a seat belt |
Not always wearing a seat belt |
|
SAVE Intervention |
34 |
48 |
|
Control |
15 |
61 |
Questions:
(1) Estimate an appropriate absolute measure of association and 95% confidence interval (CI) comparing participants who received SAVE intervention to those who received control treatment. Be sure to interpret.
(2) Estimate an appropriate relative measure of association and 95% confidence interval (CI) comparing participants who received SAVE to those who received control treatment. Be sure to interpret.
(3) Based on the CI in part d., what can we conclude about the relationship between SAVE intervention and always using a seat belt? Be sure to justify your answer.
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