Table 2.
Logistic regression analysis of characteristics for PSS in elderly patients (≥65 years)
| Variables | Univariate analysis for PSS | Multivariate analysis for PSS | ||||
|---|---|---|---|---|---|---|
| OR | 95% CI | p | OR | 95% CI | p | |
| Age | ||||||
| 65–75 years | 1 (Referent) | |||||
| >75 years | 0.677 | 0.353–1.299 | 0.241 | |||
| Gender | ||||||
| Male | 1 (Referent) | 1 (Referent) | ||||
| Female | 1.832 | 1.007–3.333 | 0.048 | 2.329 | 1.204–4.503 | 0.012 |
| Race | ||||||
| White | 1 (Referent) | |||||
| Black | 0.405 | 0.113–1.444 | 0.163 | |||
| Other | 0.480 | 0.100–2.291 | 0.357 | |||
| Marital status | ||||||
| Married | 1 (Referent) | |||||
| Unmarried | 1.166 | 0.632–2.151 | 0.623 | |||
| Year of diagnosis | ||||||
| 1973–2009 | 1 (Referent) | |||||
| 2010–2015 | 1.089 | 0.584–2.033 | 0.788 | |||
| Tumor site | ||||||
| Head | 1 (Referent) | 1 (Referent) | ||||
| Body/tail | 3.274 | 1.570–6.826 | 0.002 | 3.780 | 1.749–8.170 | 0.001 |
| Overlap | 1.611 | 0.560–4.638 | 0.377 | 1.241 | 0.418–3.681 | 0.697 |
| Other | 0.690 | 0.078–6.142 | 0.740 | 0.711 | 0.077–6.535 | 0.763 |
| Histological grade | ||||||
| Well/moderately | 1 (Referent) | 1 (Referent) | ||||
| Poorly/undifferentiated | 0.456 | 0.223–0.934 | 0.032 | 0.455 | 0.215–0.964 | 0.040 |
| Tumor size | ||||||
| ≤4 cm | 1 (Referent) | |||||
| >4 cm | 1.399 | 0.735–2.662 | 0.485 | |||
| Unknown | NA | |||||
Note: Variables with univariate analysis p<0.1 underwent further multivariate analysis.
Abbreviation: PSS, primary site surgery.