Table 4 Multivariate analysis.

From: Neck lymph node status on survival of regionally recurrent or persistent nasopharyngeal carcinoma

Covariatesp value95% CIHazard Ratio
OS
Sex0.6350.25–9.491.55
Age (>50)*0.0131.66–66.4210.50
Non-smoker*0.0340.007–0.820.07
Alcohol*0.0022.62–66.9513.25
LN + ve (>5)*0.0111.56–30.676.93
LND (>20%)*0.0371.13–51.097.60
N staging (> = 2)0.1970.10–1.60.40
Completed Adj.0.7980.31–4.511.19
DSS
Sex0.6350.24–10.141.57
Age (>50)*0.0211.36–44.037.73
Non-smoker0.4960.029–5.520.40
Alcohol0.1430.621–27.004.09
LN + ve (>5)*0.0131.511–33.477.11
LND (>20%)0.4770.246–20.442.22
N staging (> = 2)0.6550.250–9.071.51
Completed Adj.0.5840.342–6.721.52
LRRFS
Sex0.7110.08–39.021.79
Age (>50)0.1290.52–164.549.27
Non-smoker0.2690.001–7.840.07
Alcohol0.3160.126–613.268.78
LN + ve (>5)*0.0331.24–194.5015.53
LND (>20%)0.5180.06–319.654.18
N staging (> = 2)0.5570.05–226.623.49
Completed Adj.0.2920.03–2.960.28
  1. These are the outputs for multivariate analysis with proportional hazards regression for OS, DSS, and LRRFS.
  2. Notes: OS = overall survival; DSS = disease specific survival; LRRFS = locoregional recurrence free survival. LN + ve (>5): Number of positive lymph nodes more than five; LND (>20%): lymph node density more than twenty percent; N staging (> = 2), Pathological N classification with N more than or equals to two; Completed Adj.: Patients who had a completed course adjuvant therapy.
  3. 95% interval and Hazard Ratio was not calculated for smokers as it was the reference category for smoking status in this regression model.