Table 1.
Characteristics of patients older than 65 years included in the study
| Variables | Before PSM | After PSM | ||||
|---|---|---|---|---|---|---|
| NPSS, N=148 | PSS, N=62 | p | NPSS, N=62 | PSS, N=62 | p | |
| Age | 0.265 | 0.091 | ||||
| 65–75 years | 95 (64.2%) | 45 (72.6%) | 35 (56.5%) | 45 (72.6%) | ||
| ≥75 years | 53 (35.8%) | 17 (27.4%) | 27 (43.5%) | 17 (27.4%) | ||
| Gender | 0.049 | 0.281 | ||||
| Male | 89 (60.1%) | 28 (45.2%) | 35 (56.5%) | 28 (45.2%) | ||
| Female | 59 (39.9%) | 34 (54.8%) | 27 (43.5%) | 34 (54.8%) | ||
| Race | 0.247 | 0.161 | ||||
| White | 123 (83.1%) | 57 (91.9%) | 50 (80.6%) | 57 (91.9%) | ||
| Black | 16 (10.8%) | 3 (4.8%) | 9 (14.5%) | 3 (4.8%) | ||
| Other | 9 (6.1%) | 2 (3.2%) | 3 (4.8%) | 2 (3.2%) | ||
| Marital status | 0.639 | 0.855 | ||||
| Married | 96 (64.9%) | 38 (61.3%) | 36 (58.1%) | 38 (61.3%) | ||
| Unmarried | 52 (35.1%) | 24 (38.7%) | 26 (41.9%) | 24 (38.7%) | ||
| Year of diagnosis | 0.875 | 0.699 | ||||
| 1973–2009 | 53 (35.8%) | 21(33.9%) | 18 (29.0%) | 21 (33.9%) | ||
| 2010–2015 | 95 (64.2%) | 41 (66.1%) | 44 (71.0%) | 41 (66.1%) | ||
| Tumor site | 0.006 | 0.517 | ||||
| Head | 58 (39.2%) | 12 (19.4%) | 16 (25.8%) | 12 (19.4%) | ||
| Body/tail | 62 (41.9%) | 42(67.7%) | 35 (56.5%) | 42 (67.7%) | ||
| Overlap | 21 (14.2%) | 7 (11.3%) | 8 (12.9%) | 7 (11.3%) | ||
| Other | 7 (4.7%) | 1 (1.6%) | 3 (4.8%) | 1 (1.6%) | ||
| Tumor size | 0.000 | 0.097 | ||||
| ≤4 cm | 48 (32.4%) | 21 (33.9%) | 29 (46.8%) | 21 (33.9%) | ||
| >4 cm | 67 (45.3%) | 41 (66.1%) | 31 (50.0%) | 41 (66.1%) | ||
| Unknown | 33 (22.3%) | 0 (0%) | 2 (3.2%) | 0 (0%) | ||
| Histological grade | 0.032 | 1.000 | ||||
| Well/moderately | 97(65.5%) | 50 (80.6%) | 50 (80.6%) | 50 (80.6%) | ||
| Poorly/undifferentiated | 51(34.5%) | 12 (19.4%) | 12 (19.4%) | 12 (19.4%) | ||
Notes: Race: other included American Indian/AK, Native Asian/Pacific Islander. Marital status: unmarried included divorced/separated/single (never married)/unmarried or domestic partner/widowed. Tumor site: “Other” included Islets of langerhans+other specific parts of pancreas+NOS of pancreas.
Abbreviations: PSM, propensity score matching; NPSS, no primary site surgery; PSS, primary site surgery; cm, centimeter.