Table 5.

Odds ratio and relative risk

	Internal mammary nodes seen on baseline imaging	No internal mammary nodes seen on baseline imaging	Total
Distant metastases on 3 years follow-up	21	15	36
No distant metastases on 3 years follow-up	56	90	146
Total	77	105	182
Odds ratio results		Relative risk results
Odds ratio 2.3  95% Confidence interval 1.0715 to 4.7245  Z statistic 2.143  Significance level p = 0.0321  Effect Size 2.25		Relative risk 2.2  95% Confidence interval 1.2003 to 3.9660  Z statistic 2.559  Significance level p = 0.0105  NNT (Harm) 6.769