TABLE 1.
Sociodemographic, Clinical, Tumor, and Contextual Characteristics of Stage II and III Rectal Cancer
| Characteristic | % Stage II* | % Stage III* |
|---|---|---|
| n = 1524 | n = 1362 | |
| Age, y† | ||
| 66–70 | 23.3 | 27.0 |
| 71–75 | 26.4 | 30.2 |
| 76–80 | 23.7 | 21.9 |
| 81–85 | 16.5 | 14.1 |
| ≥86 | 10.2 | 6.8 |
| Race | ||
| Caucasian | 85.2 | 85.9 |
| African American | 3.9 | 4.6 |
| Asian or Pacific Islander | 5.1 | 4.4 |
| Hispanic | 4.4 | 4.5 |
| Other, unknown | 1.4 | 0.7 |
| Men | 52.9 | 55.7 |
| Marital status | ||
| Married | 55.7 | 58.6 |
| Divorced, separated, or single | 11.9 | 12.4 |
| Widowed | 31.0 | 27.8 |
| Unknown | 1.3 | 1.2 |
| Median household income in ZIP code of residence | ||
| ≤$25,000 | 13.0 | 13.6 |
| $25,001–$35,000 | 25.8 | 25.8 |
| $35,001–$45,000 | 27.6 | 25.6 |
| ≥$45,001 | 33.7 | 35.0 |
| Residence location | ||
| Isolated small rural town-focused | 6.1 | 6.5 |
| Small rural town-focused | 6.3 | 7.2 |
| Large rural city/town-focused | 7.2 | 5.4 |
| Urban-focused | 80.3 | 80.9 |
| Comorbidity score | ||
| 0 | 54.6 | 56.2 |
| 1 | 20.3 | 21.2 |
| ≥2 | 25.1 | 22.6 |
| Year of diagnosis | ||
| 1992 | 14.1 | 14.0 |
| 1993 | 14.6 | 12.9 |
| 1994 | 12.1 | 11.3 |
| 1995 | 12.8 | 12.3 |
| 1996 | 12.7 | 11.6 |
| 1997 | 11.6 | 12.4 |
| 1998 | 11.4 | 13.4 |
| 1999 | 10.8 | 12.1 |
| SEER registry | ||
| Atlanta/Rural Georgia | 4.1 | 5.2 |
| Connecticut | 16.1 | 14.8 |
| Detroit | 15.0 | 17.8 |
| Hawaii | 2.5 | 2.5 |
| Iowa | 17.3 | 17.1 |
| Los Angeles | 10.6 | 11.2 |
| New Mexico/Arizona Indians | 4.0 | 3.7 |
| San Francisco | 8.1 | 6.6 |
| San Jose | 5.9 | 4.7 |
| Seattle/Puget Sound | 10.8 | 11.2 |
| Utah | 5.5 | 5.1 |
| Hospital readmission in 1st–6th wk after surgery | 13.5 | 12.0 |
| Hospital readmission in 7th wk after surgery to end of treatment period‡ | 39.6 | 43.8 |
| Tumor extent†,§ | ||
| T1 | — | 3.5 |
| T2 | — | 17.6 |
| T3 | 91.9 | 73.9 |
| T4 | 8.1 | 5.0 |
| Tumor grade† | ||
| G1 (well differentiated) | 7.2 | 5.3 |
| G2 (moderately differentiated) | 74.4 | 67.2 |
| G3 (poorly differentiated) | 13.5 | 22.7 |
| G4 (undifferentiated) | 0.4 | 0.4 |
| Unknown | 4.5 | 4.5 |
| No. of positive nodes† | ||
| N0 (no nodes) | 81.1 | 0.6 |
| N1 (1–3) | — | 62.6 |
| N2 (4–96) | — | 31.9 |
| Nx (no nodes examined) | 18.9 | 1.8 |
| Ny (positive nodes, number not specified) | — | 3.1 |
All chi squares are overall, comparing stage II and stage III with different characteristics.
Percentages do not always add to 100 due to rounding.
P ≤.001.
P ≤.05.
T1 is tumor confined to mucosa, muscularis mucosa, head or stalk of polyp, or submucosa. T2 is tumor with muscularis propria invaded or localized, not otherwise specified. T3 is invasion through muscularis propria, wall, or invasion through perimuscular or subserosal tissue, or extension into fat, adjacent tissue, or through peritoneum. T4 is extension into bladder, prostate, vagina, pelvic wall, uterus, ureter, colon, ductus deferens, or other structure.
Missing values: median household income (58 stage II, 41 stage III), residence location (4 stage II, 4 stage III), race (3 stage II included in American Indian/other category).