Table 3.
Parameter Estimate, Odds Ratios and Confidence Intervals for Odds Ratios from Multivariate Logistic Regression for Regional or Distant vs. Local Stage of Breast Cancer
| Independent Variable1 | Parameter Estimate | P-Value Level | Odds Ratio | Confidence Interval for OR |
|---|---|---|---|---|
| Age (years) | ||||
| 18–39 | 0.7375 | *** | 2.09 | (1.94, 2.26) |
| 40–49 | 0.3960 | *** | 1.49 | (1.42, 1.56) |
| 50–64 | 0.1992 | *** | 1.22 | (1.17, 1.27) |
| 65 (+) | 1.0 | |||
| Race | ||||
| White (+) | 1.0 | |||
| Black | 0.3835 | *** | 1.47 | (1.42, 1.52) |
| American Indian/Alaska Native | 0.1262 | 1.13 | (0.96, 1.34) | |
| Asian/Pacific Islander | 0.0290 | 1.03 | (0.97, 1.09) | |
| Other | 0.1782 | 1.20 | (1.01, 1.42) | |
| Hispanic | ||||
| No (+) | 1.0 | |||
| Yes | 0.0537 | *** | 1.06 | (0.98, 1.14) |
| County Designated as Health Professional Shortage Area | ||||
| None of the County | 0.0278 | 1.03 | (1.00, 1.06) | |
| Part or All of the County (+) | 1.0 | |||
| Rural/Urban code for County3 | ||||
| Metropolitan | −0.0009 | 1.00 | (0.96, 1.03) | |
| Surburban (+) | 1.0 | |||
| Rural | 0.0102 | 1.01 | (0.93, 1.09) | |
| Percent living below poverty level | ||||
| ≤ 8.8 (+) | 1.0 | |||
| > 8.8 to ≤ 11.1 | 0.0283 | 1.03 | (0.99, 1.06) | |
| > 11.1 to ≤ 13.4 | 0.0509 | ** | 1.05 | (1.02, 1.09) |
| > 13.4 to ≤ 16.3 | 0.0660 | *** | 1.07 | (1.03, 1.11) |
| > 16.3 | 0.1269 | *** | 1.14 | (1.09, 1.18) |
| Number of mammography centers per 100,000 females2 | ||||
| ≤ 1.93 | −0.0366 | * | 0.96 | (0.93, 1.00) |
| > 1.93 to ≤ 2.34 | −0.0207 | 0.98 | (0.94, 1.02) | |
| > 2.34 to ≤ 2.97 | −0.0259 | 0.97 | (0.94, 1.01) | |
| > 2.97 to ≤ 3.81 | 0.0140 | 1.01 | (0.98, 1.05) | |
| > 3.81 (+) | 1.0 | |||
| Number of Ob/Gyns and PCPs per 100,000 females2 | ||||
| ≤ 113.21 | 0.1206 | *** | 1.13 | (1.09, 1.17) |
| > 113.21 to ≤ 170.29 | 0.0912 | *** | 1.10 | (1.06, 1.13) |
| > 170.29 to ≤ 210.44 | 0.0516 | ** | 1.05 | (1.02, 1.09) |
| > 210.44 to ≤ 260.42 | 0.0372 | * | 1.04 | (1.00, 1.07) |
| > 260.42 (+) | 1.0 | |||
| Percentage of Hispanic females4 | ||||
| ≤ 1.60 | 0.0048 | 1.00 | (0.97, 1.04) | |
| > 1.60 to ≤6.28 | −0.0286 | * | 0.97 | (0.95, 1.00) |
| > 6.28 (+) | 1.0 | |||
| Percentage of Non-Hispanic black females4 | ||||
| ≤ 1.87 | −0.0478 | 0.95 | (0.91, 1.00) | |
| > 1.87 to ≤6.44 | −0.0315 | 0.97 | (0.93, 1.01) | |
| > 6.44 (+) | 1.0 | |||
| Age x Percent Non-Hispanic black females5 | ||||
| Age 18–39, Pct NonHispanic black ≤ 1.87 | 0.0879 | |||
| Age 18–39, Pct NonHispanic black > 1.87 to ≤ 6.44 | −0.0622 | |||
| Age 40–49, Pct NonHispanic black ≤ 1.87 | 0.0684 | |||
| Age 40–49, Pct NonHispanic black > 1.87 to ≤ 6.44 | 0.0096 | |||
| Age 50–64, Pct NonHispanic black ≤ 1.87 | 0.0590 | |||
| Age 50–64, Pct NonHispanic black > 1.87 to ≤ 6.44 | 0.0596 | |||
| HispanicxPercent Non-Hispanic black females5 | ||||
| Hispanic, Pct NonHispanic black ≤ 1.87 | 0.1840 | |||
| Hispanic, Pct Non-Hispanic black > 1.87 to ≤ 6.44 | 0.1816 | |||
(+) indicates reference level.
- < 0.05.
- < 0.01.
< 0.001.
Testing that the distribution of the outcome is the same for the reported and the reference level.
The individual characteristic variables are: age, race, and Hispanic ethnicity. All other variables are characteristics at the county level (contextual variables). Except for number of mammography centers (FDA) and rural code (USDA), the contextual variables came from the Area Resource File (ARF) of HRSA. Cases from Illinois and Minnesota have been removed.
The population used in the computation is the estimated total number of females in 2003 from the US Census Bureau.
From U.S. Department of Agriculture.
From US Census Bureau.
OR for interactions are not given as they are meaningless without the main effect terms.