Table 1.

Frequency of isolation of S. aureus from medical students.

Academic degree	Students		Students colonized
	Total		S. aureus			OR	CI 95%		P
	N	%	n (%)	Nose n (%)	Skin n (%)		Min	Max
3	31	14.4	9 (14.3)	7 (15.9)	2 (10.5)	1.608	0.302	8.569	0.575
4	69	31.9	31 (49.2)	18 (40.9)	13 (68.4)	0.322	0.102	0.998	0.045
5	55	25.5	11 (17.5)	10 (27.3)	1 (5.3)	5.294	0.627	44.707	0.094
6	61	28.2	12 (19)	9 (20.5)	3 (15.8)	1.371	0.327	5.755	0.665
Total	216	100	63 (29.2)	44 (20.4)	19 (8.9)	2.870	1.658	4.969	0.000

OR: odds ratio; CI: confidence intervals; statistical significance was based on P ≤ 0.05.