Variable | OR | 95% CI | P-value | |
---|---|---|---|---|
Main effects only | ||||
Notify: Postcard vs. Letter | 1.04 | 0.77 | 1.39 | 0.80 |
Pages: 2 vs 4 | 0.81 | 0.60 | 1.09 | 0.16 |
Age: 1 year increase | 1.03 | 1.01 | 1.04 | 0.0001 |
Sex: Female vs Male | 1.86 | 1.38 | 2.50 | <.0001 |
Race: White vs non-white* | 3.35 | 1.77 | 6.35 | 0.0002 |
Race: White vs other/unknown | 2.23 | 1.49 | 3.35 | 0.0001 |
Including interaction between survey length and age | ||||
Notify: Postcard vs. Letter | 1.05 | 0.78 | 1.42 | 0.73 |
Pages: 2 vs 4 (for 25-year-olds) | 0.34 | 0.19 | 0.62 | 0.0004 |
Pages: 2 vs 4 (for 35-year-olds) | 0.53 | 0.36 | 0.79 | 0.0015 |
Pages: 2 vs 4 (for 45-year-olds) | 0.84 | 0.62 | 1.13 | 0.25 |
Pages: 2 vs 4 (for 55-year-olds) | 1.32 | 0.87 | 2.00 | 0.19 |
Sex: Female vs Male | 1.86 | 1.38 | 2.50 | <.0001 |
Race: White vs non-white* | 3.40 | 1.79 | 6.47 | 0.0002 |
Race: White vs other/unknown | 2.33 | 1.55 | 3.50 | <.0001 |