Table 4.
Logistic regression results for main effects and interactions of neighborhood poverty and primary payer on high quality investigation and early stage at diagnosis
| |
15 or more regional lymph nodes examined |
Stage I or stage II at the time of diagnosis |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| Predictor variables | No.a | OR | (95%CI) | No.a | OR | (95%CI) | |||
| Single predictor models | |||||||||
| Neighborhood poverty | |||||||||
| < 5% poor |
1,727 |
1.00 |
|
1,959 |
1.00 |
|
|||
| 5-29% poor |
1,646 |
0.92 |
(0.79, 1.07) |
1,923 |
0.81 |
(0.72, 0.92) |
|||
| ≥ 30% poor |
1,583 |
0.95 |
(0.81, 1.11) |
1,894 |
0.89* |
(0.79, 1.01) |
|||
| Primary payer | |||||||||
| Uninsured |
241 |
1.00 |
|
310 |
1.00 |
|
|||
| Medicaid |
229 |
2.01 |
(0.74, 1.65) |
261 |
1.06 |
(0.77, 1.48) |
|||
| Medicare |
2,221 |
1.11 |
(0.81, 1.53) |
2,601 |
1.33 |
(1.04, 1.71) |
|||
| Private |
2,265 |
0.97 |
(0.72, 1.30) |
2,604 |
1.30 |
(1.03, 1.65) |
|||
| Full models | |||||||||
| Neighborhood poverty | |||||||||
| < 5% poor |
1,727 |
1.00 |
|
1,959 |
1.00 |
|
|||
| 5-29% poor |
1,646 |
1.34* |
(0.99, 1.80) |
1,923 |
0.82 |
(0.72, 0.93) |
|||
| ≥ 30% poor |
1,583 |
1.97 |
(1.17, 3.32) |
1,894 |
0.91 |
(0.80, 1.04) |
|||
| Primary payer | |||||||||
| Uninsured |
241 |
1.00 |
|
310 |
1.00 |
|
|||
| Medicaid |
229 |
1.30 |
(0.86, 1.98) |
261 |
1.07 |
(0.77, 1.49) |
|||
| Medicare |
2,221 |
2.03 |
(1.22, 3.41) |
2,601 |
1.33 |
(1.03, 1.70) |
|||
| Private |
2,265 |
1.49* |
(0.97, 2.29) |
2,604 |
1.28 |
(1.01, 1.63) |
|||
| Poverty by payer |
4,956 |
0.85 |
(0.76, 0.94) |
Null interaction removed |
|||||
| Poverty by payer interaction on high quality investigation | |||||||||
| |
> 30% poor |
5-29% poor |
< 5% poor |
||||||
| |
No.a |
OR |
(95% CI) |
No.a |
OR |
(95% CI) |
No.a |
OR |
(95% CI) |
| Primary payer | |||||||||
| Uninsured |
114 |
1.00 |
|
72 |
1.00 |
|
55 |
1.00 |
|
| Medicaid |
144 |
1.11 |
(0.65, 1.88) |
63 |
0.70 |
(0.32, 1.53) |
22 |
1.91 |
(0.63, 5.79) |
| Medicare |
794 |
0.93 |
(0.58, 1.48) |
753 |
0.92 |
(0.52, 1.63) |
674 |
2.01 |
(1.02, 3.99) |
| Private | 531 | 1.00 | (0.64, 1.57) | 758 | 0.85 | (0.50, 1.45) | 976 | 1.32 | (0.68, 2.55) |
Notes. OR = odds ratio, CI = confidence interval. All effects were age-adjusted across these categories: 25–59, 60–69, 70–79, and 80 or older.
a Number of incident colon cancer cases.
* p < .10.