Table 3. Odds ratios comparing colonization with MRSA or MSSA vs. no colonization over time for a cohort of 377 college student athletes.

Table 3A. Unadjusted model
	Unadjusted
	OR	95% CI
Non-contact sports	1.00	---
Contact sports
MRSAa	2.25	1.14-4.43
MSSAa	1.68	1.06-2.65
Abbreviations: OR, odds ratio; CI, confidence interval; MRSA, methicillin-resistant Staphylococcus aureus; MSSA, methicillin-susceptible Staphylococcus aureus.
aP-value < 0.05

Table 3B. Adjusted model
	Adjustedb
	OR	95% CI
Non-contact sports	1.00	---
Contact sports
MRSAa	2.36	1.13, 4.93
MSSA	1.57	0.94, 2.62
Male	1.00	---
Female
MRSAa	0.26	0.13, 0.50
MSSA	0.80	0.50, 1.28
Caucasian	1.00	---
African-American
MRSAa	0.35	0.15, 0.79
MSSA	0.77	0.44, 1.34
Other race/ethnicity
MRSA	0.46	0.09, 2.31
MSSA	1.39	0.47, 4.15
Freshman	1.00	---
Sophomore
MRSA	1.25	0.53, 2.79
MSSAa	1.79	1.02, 3.14
Junior
MRSA	1.25	0.54, 2.90
MSSA	1.69	0.94, 3.04
Senior
MRSA	1.07	0.40, 2.81
MSSA	1.20	0.61, 2.37
Trainers
MRSA	0.97	0.14, 6.69
MSSA	0.82	0.21, 3.27
No history of S. aureus infection	1.00	---
History of S. aureus infection
MRSAa	5.35	1.51, 18.87
MSSA	2.19	0.86, 5.52
No S. aureus infections in contacts	1.00	---
Staphylococcal infections in contacts
MRSAa	0.45	0.22, 0.94
MSSA	0.72	0.43, 1.20
No comorbidities	1.00	---
Any comorbidities
MRSA	2.90	0.65, 13.01
MSSA	1.71	0.59, 5.01
No previous surgeries	1.00	---
Any Previous surgeries
MRSA	1.28	0.63, 2.60
MSSA	1.31	0.80, 2.15
No previous antibiotics	1.00	---
Previous antibiotics
MRSA	1.29	0.50, 3.34
MSSA	0.59	0.30, 1.18

Abbreviations: OR, odds ratio; CI, confidence interval; MRSA, methicillin-resistant Staphylococcus aureus; MSSA, methicillin-susceptible Staphylococcus aureus.

^aP-value < 0.05

^bAdjusted for gender, race (African-American, Caucasian, other), year (Freshman, Junior, Sophomore, Senior, trainer), history of staphylococcal infections, staphylococcal infections in contacts, any comorbidities, previous surgeries, previous antibiotics, contact sport – gender interaction, and time