Incidence of pneumonia and risk factors among patients with head and neck cancer undergoing radiotherapy

BMC Cancer

Table 4 **Medical costs* between groups with and without pneumonia acquired during RT (PNRT) by t-test**

	PNRT
	No			Yes
Variable	N	Mean	SD	N	Mean	SD	p value
Overall medical costs (US$)	15,122	9744.7	4729.5	772	11,612.3	7520.5	< 0.0001
Average daily medical costs (US$)	15,122	119.8	66.1	772	187.9	98.3	< 0.0001
Length of stay	8257	22.9	29.6	693	27.6	26.0	< 0.0001

*: Cost calculated for each patient within 90 days from the start of radiotherapy.

ISSN: 1471-2407