Non-OSNA Group (n = 137)

OSNA Group (n = 240)

1) Age (mean in years +/− SD)

60.8 (+/− 12)

61.4 (+/− 12)

P = 0.642^*

2) Tumour Grade (mode)

2

2

P = 0.58^**

3) Tumour Size (mean in mm +/− SD)

18.9 (+/− 11.1)

16.9 (+/− 10.7)

P = 0.1^*

4) Total Nodes Involved (mean +/− SD)

0.77 (+/− 2.5) (range 0 - 23)

0.86 (+/− 2.5) (range 0 - 23)

P = 0.74^*