Table 3.
Test of prevalence differences and degree of agreement for ordinal variables.
| Phone administered |
Internet administered |
Location test |
Degree of agreement |
|||
|---|---|---|---|---|---|---|
| Variable name | N/n | Yes (%) | Yes (%) | p-value | κ b | 95% CI |
| Incomea | 210 | .1382 | .93 | (.85–1.00) | ||
| Less than US$10,000 | 1.90 | 2.38 | ||||
| US$10,000 to US$20,000 | 9.05 | 9.05 | ||||
| US$20,000 to US$30,000 | 16.19 | 17.62 | ||||
| US$30,000 to US$40,000 | 17.62 | 13.81 | ||||
| US$40,000 to US$50,000 | 15.71 | 18.10 | ||||
| US$50,000 to US$75,000 | 20.48 | 20.00 | ||||
| US$75,000 to US$100,000 | 9.52 | 10.00 | ||||
| US$100,000 or more | 9.52 | 9.05 | ||||
| Health status | 212 | .1109 | .73 | (.64–.82) | ||
| Excellent | 7.55 | 6.60 | ||||
| Very good | 39.62 | 40.57 | ||||
| Good | 35.38 | 38.21 | ||||
| Fair | 15.57 | 13.68 | ||||
| Poor | 1.89 | 0.94 | ||||
a
Income scored at category midpoint; US$125,000 used for last category.
b
Weighted kappa using absolute difference between category scores to define a distance measure.