Table 2.
Variable | 3 mo, No. (%) (n = 588) | 6 mo, No. (%) (n = 510) |
---|---|---|
Demographics | ||
Los Angeles site | 303 (52) | 245 (48) |
Female sex | 368 (63) | 334 (66) |
Age | ||
Younger child (<5 y) | 79 (13) | 56 (11) |
Child (5–18 y) | 129 (22) | 104 (20) |
Adult (19–65 y) | 353 (60) | 324 (64) |
Older adult (>65 y) | 27 (5) | 26 (5) |
Ethnicity | ||
African American | 282 (48) | 261 (51) |
White | 35 (6) | 34 (7) |
Hispanic | 232 (40) | 186 (37) |
Other/mixed/unknown | 39 (7) | 29 (6) |
Clinical factors | ||
Comorbidities | ||
Charlson comorbidity score | ||
Mean ± SD | 0.4 ± 0.9 | 0.4 ± 0.9 |
Median (range) | 0 (0–7) | 0 (0–7) |
Diabetes | 56 (10) | 48 (10) |
HIV infection | 4 (1) | 4 (1) |
In the past 3 mo | ||
Underwent major surgery | 39 (7) | 10 (2) |
Received dialysis | 1 (0) | 2 (0) |
Hospitalized | 66 (11) | 14 (3) |
Skin infection | 57 (10) | 40 (9) |
In the past 12 mo | ||
Any antibiotic exposure | 181 (32) | 158 (32) |
Use of clindamycin | 7 (1) | 9 (2) |
Use of TMP-SMX | 8 (1) | 9 (2) |
Use of cephalexin | 14 (2) | 12 (2) |
Use of immunosuppressant medications | 57 (10) | 58 (12) |
Spent time living in a skilled nursing facility, rehabilitation center, or other type of group facility | 18 (3) | 15 (3) |
Epidemiologic factors | ||
Homelessness in the past 12 mo | 30 (5) | 24 (5) |
In the past 3 mo | ||
Illicit drug use | 34 (8) | 20 (6) |
Showered at least once a day | 432 (74) | 338 (75) |
Shared makeup with others | 63 (12) | 40 (10) |
Shared clothes with others with washing | 29 (5) | 17 (4) |
Shared any towels with others | 297 (51) | 149 (34) |
Wore clothes more than once without washing | 283 (49) | 209 (47) |
Hand-washing frequency after using the bathroom | ||
Mean ± SD | 2.7 ± 0.61 | 2.8 ± 0.56 |
Median (range) | 3 (0–3) | 3 (0–3) |
Participated in contact sports | 147 (25) | 94 (21) |
Went to daycare | 10 (11) | 13 (14) |
Colonization | ||
Any colonization with S. aureus | 282 (48) | 207 (42) |
Any colonization with MRSA | 125 (21) | 85 (17) |
Any colonization with index subject's infection isolate | 95 (16) | 62 (13) |
Nasal colonization with index subject's infection isolate | 41 (7) | 32 (7) |
Oropharyngeal colonization with index subject's infection isolate | 44 (7) | 28 (6) |
Inguinal colonization with index subject's infection isolate | 47 (8) | 26 (5) |
Abbreviations: HIV, human immunodeficiency virus; MRSA, methicillin-resistant Staphylococcus aureus; S. aureus, Staphylococcus aureus; SD, standard deviation; TMP-SMX, trimethoprim-sulfamethoxazole.