TABLE 3.
Stepwise logistic regression results for associations between covariates and three different outcome variables
| Model 1 |
Model 2 |
Model 3 |
||||
|---|---|---|---|---|---|---|
| Variable Lista | OR | 95% CI | OR | 95% CI | OR | 95% CI |
| Age group, y | ||||||
| <65 | ...b | 1.155 | (1.002–1.332) | 1.376 | (1.370–1.382) | |
| 65+ | ... | Ref | Ref | |||
| Ethnicity | ||||||
| African-American | 1.243 | (0.951, 1.624) | ... | ... | ||
| Other | 0.386 | (0.152, 0.931) | ... | ... | ||
| Caucasian | Ref | ... | ... | |||
| Year of treatment | ||||||
| 2014 to 2016 | 2.180 | (1.874–2.535) | ... | 2.007 | (1.994–2.021) | |
| 2010 to 2013 | Ref | ... | Ref | |||
| Area of residence | ||||||
| Metro | 1.362 | (1.610–2.455) | ... | 1.741 | (1.732–1.751) | |
| Nonmetro | Ref | ... | Ref | |||
| Education level | ||||||
| Low | ... | 1.324 | (1.164–1.506) | ... | ||
| High | ... | Ref | ... | |||
| Insurance status | ||||||
| Private | ... | ... | 2.559 | (2.546–2.572) | ||
| Medicare | ... | ... | 1.935 | (1.923–1.947) | ||
| Medicaid | ... | ... | 2.022 | (1.999–2.045) | ||
| Other public | ... | ... | 1.029 | (1.005–1.053) | ||
| Unknown | ... | ... | 0.897 | (0.864–0.931) | ||
| Not Insured | ... | ... | Ref | |||
| Treatment at academic hospital | ||||||
| Yes | 1.988 | (1.610–2.455) | ... | ... | ||
| No | Ref | ... | ... | |||
| Nodes examined | ||||||
| 0 | ... | 2.501 | (0.781–8.013) | 0.559 | (0.550–0.568) | |
| 1 to 11 | ... | 0.769 | (0.644–0.919) | 0.507 | (0.505–0.509) | |
| Unknown | ... | 1.017 | (0.467–2.217) | 0.193 | (0.188–0.198) | |
| 12+ | ... | Ref | Ref | |||
| Nodes positive | ||||||
| 0 | ... | 1.883 | (1.258–2.819) | ... | ||
| 1 to 11 | ... | 1.448 | (0.990–2.118) | ... | ||
| Unknown | ... | 0.796 | (0.243–2.614) | ... | ||
| 12+ | ... | Ref | ... | |||
| Tumor grade | ||||||
| Moderately differentiated | 0.953 | (0.734–1.238) | 1.551 | (1.542–1.560) | ||
| Poorly differentiated | 0.706 | (0.544–0.916) | ... | 2.045 | (2.034–2.057) | |
| Undifferentiated | 1.359 | (0.232–7.950) | ... | 10.664 | (8.715–13.049) | |
| Unknown | 0.976 | (0.509–1.873) | ... | 0.361 | (0.355–0.368) | |
| Well-differentiated | Ref | Ref | ||||
| Hormone receptor status | ||||||
| Positive | ... | 1.366 | (1.179, 1.582) | ... | ||
| Unknown | ... | 1.289 | (0.738, 2.252) | ... | ||
| Negative | ... | Ref | ... | |||
| HER2 status | ||||||
| Negative | 1.103 | (0.862–1.411) | ... | ... | ||
| Borderline | 1.366 | (1.022–1.827) | ... | ... | ||
| Unknown | 0.949 | (0.724–1.244) | ... | ... | ||
| Positive | Ref | ... | ... | |||
| Stage group | ||||||
| Early stage | ... | ... | 5.661 | (5.640–5.682) | ||
| Unknown | ... | ... | 10.186 | (9.872–10.511) | ||
| Late stage | ... | ... | Ref | |||
| Type of surgery | ||||||
| Mastectomy | 0.909 | (0.762–1.084) | 1.312 | (1.138–1.513) | 1.884 | (1.870–1.898) |
| NOS | <0.001 | (<0.001, >999.999) | 1.429 | (0.147, 13.889) | 8.409 | (6.999–10.102) |
| Lumpectomy | Ref | Ref | Ref | |||
| Reconstruction | ||||||
| Yes | 3.748 | (2.780–5.053) | 0.829 | (0.686–1.002) | 0.758 | (0.745–0.770) |
| No | Ref | Ref | Ref | |||
Abbreviations: CI, confidence interval; HER2, human epidermal growth factor receptor 2; NOS, not otherwise specified; OR, odds ratio.
a
Variables were found significant in stepwise logistic regression models. Model 1 models patients experience delays from diagnosis to surgery. Model 2 models patients experience delays from surgery to chemotherapy. Model 3 models patients experience delays from surgery to radiation.
b
Variable is not significant in stepwise logistic regression.