Table 5.

Number (percentage) of patients in groups differing in the extent of spread to the lymph nodes (N) and a 12-month survival or a 24-month survival, the result of the test of independence, OR and its 95% confidence interval

Degree of spread to regional	12-month survival		P-value	OR (95% CI)
Yes N=129	No N=104
N1 or N2	100 (77.5%)	33 (31.7%)	<0.001	7.42 (4.14–13.3)
N3	29 (22.5%)	71 (68.3%)	1.00 (ref.)
Degree of spread to regional	24-month survival		P-value	OR (95% CI)
Yes N=83	No N=150
N1 or N2	66 (79.5%)	67 (44.7%)	<0.001	4.81 (2.58–8.96)
N3	17 (20.5%)	83 (55.3%)	1.00 (ref.)