Association of insertion-deletions polymorphisms with colorectal cancer risk and clinical features

Table 2 Participant demographic and clinical characteristics and their stratification by case and control groups

Characteristic	Total, n = 280	Cases, n = 140	Controls, n = 140	P value
Age (yr)	48 (21-93)	59 (23-93)	37 (21-81)	< 0.001
< 45	136 (48.7)	23 (16.5)	113 (80.7)
≥ 45	144 (51.3)	116 (83.5)	27 (19.3)
Gender				< 0.001
Male	172 (61.6)	62 (44.6)	110 (78.6)
Female	108 (38.4)	78 (55.4)	30 (21.4)
Alcohol consumption				< 0.001
No	180 (65.1)	118 (85.5)	62 (44.9)
Yes	96 (34.9)	20 (14.5)	76 (55.1)
Eventually	56 (20.4)	11 (8.0)	45 (32.6)
Frequently	40 (14.5)	9 (6.5)	31 (22.5)
Tobacco consumption				< 0.001
Never	182 (65.4)	68 (48.9)	114 (82.0)
Already	96 (24.6)	71 (48.1)	25 (18.0)
Former	66 (23.8)	55 (39.6)	11 (7.9)
Current	30 (10.8)	16 (11.5)	14 (10.1)

Categorized data are presented by absolute numbers of individuals (percentage) and analyzed by Chi-square test. Continuous data are presented by mean (min-max) and analyzed by Mann-Whitney test.