TABLE 1

Characteristics of Study Population for Pneumococcal Surveillance in Massachusetts, 2001–2014

200120042007200920112014
N = 678 (%)N = 987 (%)N = 1540 (%)N = 1011 (%)N = 1164 (%)N = 1157 (%)
Communities
 A588121111
 B10108121111
 C5810131211
 D769121111
 E585111211
 F677151111
 G578141111
 H558121111
 Other communities5241370911
Age group (mo)
 <6959877
 6–<12171217171814
 12–<24212326232327
 24–<59364235383536
 60–<84171813141616
Female465348484647
Young siblings
 0535058545350
 1373934373741
 ≥2101189109
Child care (h)
 0–<4564950434644
 4–1015128121212
 11–206148121110
 >20242633333334
Smoker in household302120262220
Breastfeeding
 No393527292423
 Yes, for <3 mo181719202021
 Yes, for 3–6 mo242124222625
 Yes, for >6 mo192730283031
Presence of respiratory tract infection at time of swab (chart only)292746393333
Race
 White, non-Hispanic788453826968
 Black, non-Hispanic742851213
 Hispanic861271113
 Asian/Pacific Islander322455
 Other554131