| Baseline characteristics original cohort | Baseline characteristics LN yield < 10 vs. ≥ 10 | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
 |  |  | Unadjusted dataa | IPW adjusted data for the confounders considered for the primary analysisa,c | IPW adjusted data for the confounders considered for the secondary supporting analysisa,d | ||||||
 | N = 1017a | Missing (%)b | LN yield < 10 N = 612 | LN yield ≥ 10 N = 405 | P value | LN yield < 10 N = 612 | LN yield ≥ 10 N = 405 | P value | LN yield < 10 N = 612 | LN yield ≥ 10 N = 405 | P value |
Age in years | 69.1 | 0.5 | 68.6 | 69.7 | 0.07 | 69.1 | 69.0 | 0.47 | 69.1 | 69.1 | 0.74 |
Male sex | 54.6 | 0 | 55.7 | 52.8 | 0.40 | 54.6 | 54.0 | 0.30 | 54.5 | 53.7 | 0.35 |
BMI in kg/m2 | 26.9 | 27.9 | 26.9 | 27.0 | 0.70 | 26.8 | 27.0 | 0.54 | 26.7 | 27.1 | 0.46 |
ASA score | Â | 0.4 | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 - ASA I  - ASA II  - ASA III–IV | 29.7 49.5 20.8 | 31.6 47.5 20.9 | 26.9 52.3 20.7 | 0.13 0.15 0.99 | 30.3 47.8 21.8 | 29.0 52.0 18.9 | 0.67 0.20 0.24 | 30.1 48.0 21.9 | 29.1 51.8 19.0 | 0.79 0.25 0.25 | |
Tumor location | Â | 0 | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 - Right colon  - Left colon  - Rectum | 24.1 58.8 17.1 | 15.2 68.6 16.2 | 37.5 44.0 18.5 | <0.001 <0.001 0.38 | 24.2 58.7 17.0 | 24.1 58.8 17.1 | 0.62 0.89 0.67 | 23.9 59.0 17.1 | 23.9 58.9 17.2 | 0.84 0.83 0.85 | |
Tumor morphology | Â | 5.0 | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 - Pedunculated  - Non-pedunculated | 33.4 66.6 | 39.3 60.7 | 24.1 75.9 | <0.001 <0.001 | 33.3 66.7 | 33.7 66.3 | 0.39 0.39 | 33.4 66.6 | 33.7 66.3 | 0.68 0.68 | |
Tumor size in cm | 2.7 | 9.4 | 2.6 | 2.9 | 0.003 | 2.7 | 2.7 | 0.82 | 2.7 | 2.7 | 0.82 |
Lymph node metastasis | 8.3 | 0 | 6.0 | 11.6 | 0.002 | 8.6 | 8.5 | 0.91 | 8.3 | 8.4 | 0.75 |
Adjuvant chemotherapy | 4.4 | 0 | 3.6 | 5.7 | 0.15 | 4.6 | 4.5 | 0.92 | 4.4 | 4.6 | 0.82 |
Lymphovascular invasion | Â | 53.8 | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 - Absent  - Present | 79.2 20.8 | 70.1 29.9 | 79.8 20.2 | 0.04 0.04 | 69.7 30.3 | 78.9 21.1 | 0.03 0.03 | 73.3 26.7 | 73.2 26.8 | 0.70 0.70 | |
Differentiation grade | Â | 18.5 | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 - Well  - Moderate  - Poor | 14.0 80.6 5.4 | 14.9 79.4 5.7 | 12.7 82.3 5.0 | 0.44 0.31 0.63 | 15.1 79.6 5.4 | 12.9 82.0 5.1 | 0.47 0.41 0.59 | 14.1 80.6 5.3 | 14.2 80.7 5.1 | 0.71 0.73 0.62 | |
Invasion depth | Â | 50.3 | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 - Haggitt I/II/III or SM1  - Haggitt IV or SM2/3 | 44.9 55.1 | 47.3 52.7 | 41.4 58.6 | 0.21 0.21 | 43.7 56.3 | 45.8 54.2 | 0.67 0.67 | 44.6 55.4 | 44.3 55.7 | 0.83 0.83 |