Table 3.

Multivariate analysis of DIGEST scores for CUP compared to BOT primaries.

		Post-op DIGEST overall score = 2–4		Post-op DIGEST safety score = 2–4
Covariate	Level	Odds Ratio (95% CI)	OR P-value	Odds Ratio (95% CI)	OR P-value
Tumor Subsite	Unknown primary	0.39 (0.13–1.12)	0.081	0.28 (0.08–0.93)	0.038
	Base of tongue	–	–	–	–
Age at surgery		1.03 (0.98–1.09)	0.283	1.04 (0.98–1.11)	0.168

^*Number of observations in the original data set = 67.

Number of observations used = 67.

Backward selection with an alpha level of removal of 0.05 was used. No variables were removed from the model.