Table 1.

Demographic data of patients with and without IP

	Patients with IP	Patients without IP	Level of statistical significance
Number	n = 54	n = 318
Gender, number (percentage of columns)			Chi square test p = 0.09
Female	n = 21(39%)	n = 163 (49%)
Male	n = 33 (61%)	n = 155 (51%)
Age (years)			Mann-Whitney test p = 0.44
Minimum	19	18
Median	57	60
Maximum	89	93