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Table 1 Characteristics of the study population.

From: Epidemiology and risk factors for Staphylococcus aureuscolonization in children in the post-PCV7 era

  Total N = 1,968) 16 communities swabbed in 2003–04 (N = 994) 8 communities swabbed in 2006–07 (N = 974)
   8 communities swabbed in 2003–04 only (N = 406) 8 communities swabbed in both seasons (N = 588) 8 communities swabbed in both seasons (N = 974)
Age group (N = 1,968)     
   3–<6 months 131 (6.7%) 25 (6.2%) 30 (5.1%) 76 (7.8%)
   6–<12 months 299 (15.2%) 53 (13.1%) 67 (11.4%) 179 (18.4%)
   1–<2 years 477 (24.2%) 100 (24.6%) 129 (21.9%) 248 (25.5%)
   2–<3 years 274 (13.9%) 61 (15.0%) 82 (14.0%) 131 (13.5%)
   3–<4 years 237 (12.0%) 57 (14.0%) 84 (14.3%) 96 (9.9%)
   4–<5 years 231 (11.7%) 50 (12.3%) 79 (13.4%) 102 (10.5%)
   5–<7 years 319 (16.2%) 60 (14.8%) 117 (19.9%) 142 (14.6%)
Female (N = 1,968) 981 (49.9%) 216 (53.2%) 308 (52.4%) 457 (46.9%)
Race/ethnicity (N = 1,872)     
   White non-Hispanic 1,565 (83.6%) 341 (83.9%) 463 (84.0%)20 (3.6%) 761 (82.4%)
   Black non-Hispanic 86 (4.6%) 15 (3.8%) 20 (3.6%) 51 (5.5%)
   Hispanic 122 (6.5%) 23 (5.8%) 28 (5.1%) 71 (7.7%)
   Other 99 (5.3%) 18 (4.5%) 40 (7.3%) 41 (4.4%)
Median household income in community (N = 1,869)*     
   <40,000 373 (20.0%) 125 (31.8%) 104 (18.4%) 144 (15.8%)
   40,000–<55,000 620 (33.2%) 122 (31.0%) 191 (33.9%) 307 (33.7%)
   55,000–<70,000 447 (23.9%) 85 (21.6%) 135 (23.9%) 227 (24.9%)
   ≥70,000 429 (23.0%) 61 (15.5%) 134 (23.8%) 234 (26.7%)
% community members with <high school educational level (N = 1,869)*     
   <5% 297 (15.9%) 57 (14.5%) 79 (14.0%) 161 (17.7%)
   5–<10% 387 (20.7%) 95 (24.2%) 111 (19.7%) 181 (19.9%)
   10–<15% 485 (26.0%) 66 (16.8%) 164 (29.1%) 255 (28.0%)
   ≥15% 700 (37.5%) 175 (44.5%) 210 (37.2%) 315 (34.5%)
Ever breastfed (N = 1,900) 1,291 (68.0%) 237 (59.4%) 400 (69.8%) 654 (70.5%)
Childcare or school for ≥4 hours (N = 1,857) 941 (50.7%) 184 (46.8%) 296 (53.9%) 461 (50.4%)
Smokers in home (N = 1,784) 355 (19.9%) 97 (25.5%) 87 (16.1%) 171 (19.9%)
Family member works in hospital or LTCF (N = 1,888) 328 (17.4%) 66 (16.7%) 98 (17.5%) 164 (17.6%)
Antibiotics in past 2 months (N = 1,945)     
   Amoxicillin-clavulanate/cephalosporins/mupirocin/TMP-SMX 212 (10.9%) 42 (10.8%) 61 (10.5%) 109 (11.2%)
   Clindamycin/macrolides 82 (4.2%) 22 (5.7%) 24 (4.1%) 36 (3.7%)
   Amoxicillin/penicillin 332 (17.1%) 74 (19.0%) 86 (14.8%) 172 (17.7%)
   None 1,319 (67.8%) 251 (64.5%) 411 (70.6%) 657 (67.5%)
Antibiotics in past 6 months for skin infection (N = 1,950) 29 (1.5%) 0 (0%) 1 (0.2%) 28 (2.9%)
History of chronic illness     
   Asthma/RAD (N = 1,950) 199 (10.2%) 27 (6.9%) 80 (13.7%) 92 (9.5%)
   Skin condition† (N = 974) 47 (4.8%) - - 47 (4.8%)
Diagnosis on day of visit (N = 1,950)     
   Asthma/RAD 73 (3.7%) 18 (4.6%) 19 (3.3%) 36 (3.7%)
   Rash 65 (3.3%) 9 (2.3%) 12 (2.1%) 44 (4.5%)
   Otitis media 258 (13.2%) 30 (7.7%) 61 (10.5%) 167 (17.2%)
   Respiratory tract infection 461 (23.6%) 76 (19.4%) 95 (16.3%) 290 (29.8%)
   Skin/soft tissue infection 14 (0.7%) 0 (0%) 1 (0.2%) 13 (1.3%)
   Allergic rhinitis/seasonal allergies 13 (0.7%) 3 (0.8%) 7 (1.2%) 3 (0.3%)
Colonization with Streptococcus pneumoniae (N = 1,964) 524 (26.7%) 91 (22.4%) 141 (24.0%) 292 (30.1%)
Pneumococcal vaccination** (N = 1,950)     
   0 doses 209 (10.7%) 76 (19.4%) 113 (19.4%) 20 (2.1%)
   1 dose 170 (8.7%) 40 (2.1%) 61 (3.1%) 69 (7.1%)
   2 doses 194 (10.0%) 38 (9.7%) 82 (14.0%) 74 (7.6%)
   3 doses 1377 (70.6%) 238 (60.7%) 328 (56.2%) 811 (83.3%)
Influenza vaccination prior to visit††(N = 1,950) 467 (24.0%) 65 (16.6%) 45 (7.7%) 357 (36.7%)
  1. *Household income and educational level based on geocoded information from 2000 U.S. census.
  2. † Assessed in 2007–08 season only
  3. ** Pneumococcal dose included if given at least 30 days prior to swab
  4. †† Flu vaccination in that season at least 2 weeks prior to visit