Table 1.
Demography of Individuals With Invasive Pneumococcal Disease Aged 6 Weeks to <6 Years and All Ages (≥6 Weeks) at Kaiser Permanente Northern California
| Characteristic | IPD Cases 6 wk to <6 y, na (%) (Nb = 159) | IPD Cases All Ages (≥6 wk), na (%) (Nb = 2721) | Kaiser Permanente Northern California Population All ages (≥6 wk), %c (Nd = 3 828 462) |
|---|---|---|---|
| Sex | |||
| Male | 102 (64.2) | 1386 (50.9) | 48.5 |
| Female | 57 (35.8) | 1335 (49.1) | 51.5 |
| Agee | |||
| 6 wk to <6 y | … | 159 (5.8) | 7.0 |
| 6 wk to <2 y | 66 (41.5) | … | … |
| 6 wk to <1 y | 24 (15.1) | … | … |
| 1 y to <2 y | 42 (26.4) | … | … |
| 2 y to <6 y | 93 (58.5) | … | … |
| 6 y to <18 y | … | 90 (3.3) | 15.2 |
| 18 y to <50 y | … | 521 (19.1) | 44.3 |
| 50 y to <65 y | … | 776 (28.5) | 20.0 |
| 65 y to <80 y | … | 690 (25.4) | 10.2 |
| ≥80 y | … | 485 (17.8) | 3.3 |
| Race/ethnicity | |||
| Asian | 36 (22.6) | 277 (10.2) | 18.2 |
| Black | 24 (15.1) | 352 (12.9) | 7.1 |
| Hispanic | 27 (17.0) | 353 (13.0) | 18.6 |
| Multiracial | 5 (3.1) | 145 (5.3) | 4.8 |
| Native American | 1 (0.6) | 14 (0.5) | 0.5 |
| Pacific Islander | 5 (3.1) | 46 (1.7) | 0.6 |
| Unknown/other | 9 (5.7) | 38 (1.4) | 2.7 |
| White | 52 (32.7) | 1496 (55.0) | 47.5 |
All IPD cases, regardless of membership and whether serotyped, were included. Membership refers to patients who were members of Kaiser Permanente Northern California (KPNC) for at least 2 months in each year. An IPD case was a unique case separated by a period of 14 days. For individuals ≥6 weeks of age, average age across the study period was used.
Abbreviation: IPD, invasive pneumococcal disease.
aNumber of IPD cases in specified category.
bNumber of IPD cases in specified group.
cPercent of KPNC population.
dAverage number of KPNC population across the study period.
eBased on age at time of specimen collection.