Table 2.
Demographic Risk Factors for Community-Associated Methicillin-Resistant and Methicillin-Sensitive Staphylococcus aureus
| Demographics, All Subjects | CA-MSSA (n = 313) No. (Weighted %)a | CA-MRSA (n = 270) No. (Weighted %)a | P Value |
|---|---|---|---|
| Sex | |||
| Male | 173 (55.6%) | 116 (41.7%) | .006 |
| Race/ethnicity | <.0001 | ||
| Native American/Alaska Native | 7 (2.2%) | 1 (0.2%) | <.0001 |
| Asian/Pacific Islander | 52 (13.0%) | 17 (4.4%) | .0003 |
| Black or African-American | 63 (25.8%) | 128 (53.2%) | <.0001 |
| Hispanic | 82 (27.7%) | 54 (19.0%) | .04 |
| White | 50 (16.1%) | 28 (8.4%) | .01 |
| Other | 6 (2.4%) | 7 (3.1%) | .70 |
| Multiethnic | 14 (3.1%) | 11 (4.0%) | .54 |
| Unknown | 39 (9.7%) | 24 (7.7%) | .43 |
| Age | |||
| Mean (years) | 6.7 years | 5.1 years | .003 |
| Median in years (95% CI) | 5.5 (4.3, 6.7) | 1.5 (1.1, 1.9) | |
| < 1 | 52 (16.4%) | 56 (20.8%) | |
| 1–3 | 69 (23.1%) | 97 (37.6%) | |
| 4–9 | 88 (29.4%) | 47 (17.1%) | .003 |
| 10–14 | 59 (15.9%) | 33 (12.2%) | |
| 15–18 | 45 (15.2%) | 35 (15.2%) | |
| Demographics, Interviewed Subjects | CA-MSSA (n = 95) No. (Weighted %)a | CA-MRSA (n = 58) No. (Weighted %)a | P Value |
| Household income | |||
| < $40,000 | 34 (40.7%) | 31 (59.0%) | .008 |
| $40,001–$60,000 | 9 (9.0%) | 6 (9.7%) | |
| $60,001–$80,000 | 10 (9.6%) | 3 (3.5%) | |
| $80,001–$100,000 | 6 (4.8%) | 1 (0.7%) | |
| > $100,000 | 19 (18.6%) | 4 (5.6%) | |
| Refused | 6 (3.6%) | 7 (13.2%) | |
| Unknown | 11 (13.8%) | 6 (8.3%) | |
| Homelessness | |||
| Homeless in year before infection | 2 (2.4%) | 2 (2.9%) | .84 |
| Slept at another person's home in year before infection because had no other place to go | 6 (7.2%) | 9 (14.6%) | .47 |
| Parent education level | .06 | ||
| < High school | 7 (9.0%) | 4 (8.3%) | |
| High school | 19 (22.2%) | 24 (43.1%) | |
| Some college or vocational training | 17 (18.6%) | 14 (25.0%) | |
| Bachelor's degree | 24 (21.6%) | 7 (10.4%) | |
| Postgraduate degree | 20 (20.4%) | 5 (6.3%) | |
| Refused | 3 (1.8%) | 1 (2.1%) | |
| Unknown | 5 (6.6%) | 3 (4.9%) |
Abbreviations: CA-MRSA, community-associated methicillin-resistant Staphylococcus aureus; CA-MSSA, community-associated methicillin-sensitive S aureus; CI, confidence interval.
aPercentages calculated based on weighted data (weight of 3 for Children's Hospital Oakland subjects, 1 for all other subjects).