Table 1.
Baseline Characteristics for 204 Colorectal Cancer Patients.
| Nitrous Oxide | Nitrogen | |||
| Factor | Level | N = 97 | N = 107 | P-Value |
| Gender | Female | 40 (41) | 39 (37) | 0.48 |
| Hospital | AKH | 87 (90) | 94 (88) | 0.68 |
| SMZ-OST | 10 (10) | 13 (12) | ||
| Dukes classification | A | 17 (19) | 16 (16) | 0.96 |
| B | 27 (30) | 31 (30) | ||
| C | 33 (36) | 38 (37) | ||
| D | 14 (15) | 17 (17) | ||
| Tumor Grade | G1 | 3 (3) | 5 (5) | 0.68 |
| G2 | 67 (74) | 75 (72) | ||
| G3 | 19 (21) | 24 (23) | ||
| G4 | 1 (1) | 0 (0) | ||
| Site | Ascending Colon | 10 (11) | 18 (17) | 0.73 |
| Sigmoid Colon | 28 (30) | 30 (28) | ||
| Rectal | 45 (48) | 44 (42) | ||
| Cecum | 10 (11) | 13 (12) | ||
| Multiple | 1 (1) | 1 (1) | ||
| Dissemination | Yes | 23 (24) | 25 (24) | 0.92 |
| Invasion to Adjacent Organs | Yes | 31 (33) | 28 (26) | 0.33 |
| Neural Invasion | Yes | 9 (10) | 10 (9) | 0.95 |
| Vessel Invasion | Yes | 21 (23) | 27 (26) | 0.63 |
| Treatment of Tumor besides surgery | None | 36 (39) | 50 (48) | 0.30 |
| Chemotherapy | 30 (32) | 30 (29) | ||
| Radiation | 15 (16) | 9 (9) | ||
| Both | 12 (13) | 16 (15) | ||
| Age (Years) | 61 ± 11 | 63 ± 11 | 0.41 | |
| Number of Nodes examined | 16 [12, 21] | 15 [12, 23] | 0.97 | |
| Number of involved Nodes | 0 [0, 4] | 1 [0, 3] | 0.88 | |
| Preoperative CEA | 4.9 [1.7, 13.0] | 3.5 [1.9, 7.5] | 0.70 | |
| Recurrence-free survival (years) | 3.9 [1.2, 5.4] | 4.4 [1.1, 5.2] | 0.89 |
AKH is the Vienna General Hospital; SMZ-OST is the Danube Hospital, also in Vienna, Austria. Statistics presented as number (%), means ± SDs, or medians [first-to-third quartile range]. P-values, respectively, are from Pearson's Chi-Squared Test, Student's T-Test, and Wilcoxon's Rank Sum Test.