Table 5.

Association between SLNB and the End Point of 1-year or 3-year Overall Survival in the Crude Analysis, Multivariable Analysis and Propensity-Score Analyses.

Analysis	1-Year overall survival	3-Year overall survival
No. of events/no. of patients at risk (%)
No SLNB	717/2044	1156/2044
SLNB	109/779	326/779
Crude analysis—hazard ratio (95% CI)	0.34 (0.28, 0.42)	0.59 (0.52, 0.67)
Multivariable analysis—hazard ratio (95% CI)*	0.45 (0.36, 0.57)	0.71 (0.62, 0.82)
Propensity-score analyses—hazard ratio (95% CI)
With inverse probability weighting†	0.41 (0.30, 0.54)	0.81 (0.65, 0.99)
With matching‡	0.40 (0.31, 0.50)	0.70 (0.60, 0.81)

*Shown is the hazard ratio from the multivariable Cox proportional-hazards model, with adjustment for age, sex, social economic status, cancer sites, lymph node dissection, diabetes, hypertension, coronary artery disease, stroke, congestive heart failure, cirrhosis, Parkinson disease, COPD, malignancy. The analysis included all 2823 patients.

^†Shown is the primary analysis with a hazard ratio from the multivariable Cox proportional-hazards model with covariates with inverse probability weighting according to the propensity score. The analysis included 2823 patients.

^‡Shown is the hazard ratio from a multivariable Cox proportional-hazards model with covariates with matching according to the propensity score. The analysis included 2049 patients (1366 without SLNB and 683 undergoing SLNB).