Table 3.

Baseline Household Colonization Pressure by Colonization Status of Cases at Follow-up^a

Follow-up Visit	Baseline MRSA HHCP, Median % (IQR)		P	Baseline MSSA HHCP, Median % (IQR)		P
	Colonized With MRSA at Follow-up	Not Colonized With MRSA at Follow-up		Colonized With MSSA at Follow-up	Not Colonized With MSSA at Follow-up
Ever Colonizedb	42 (0–62)	0 (0–0)	<.001	50 (0–67)	0 (0–46)	.01
1 Month	50 (23–69)	0 (0–0)	<.001	50 (0–67)	25 (0–50)	.16
3 Months	25 (0–50)	0 (0–25)	.01	50 (19–67)	25 (0–50)	.04
6 Months	42 (0–81)	0 (0–31)	.01	45 (0–100)	25 (0–50)	.11
12 Months	50 (0–60)	0 (0–25)	.01	50 (0–75)	25 (0–50)	.03

Abbreviations: HHCP, household colonization pressure; IQR, interquartile range; MRSA, methicillin-resistant. Staphylococcus aureus; MSSA, methicillin-sensitive S aureus.

^aMann-Whitney U test was used to analyze differences in mean between groups.

^bColonized at any of the follow-up visits.