Table II.
Number of cases and incidence rate of invasive pneumococcal disease in persons ≥5 years of age in Nunavik, Quebec, by period, 1997–2010
| Number of cases (% total) | Incidence rate per 100,000 persons-year | ||||||
|---|---|---|---|---|---|---|---|
|
|
|
Rate ratio 2004–2010 vs. 1997–2001 (p-value) | |||||
| Serotypes | 1997–2001 | 2002–2003 | 2004–2010 | 1997–2001 | 2002–2003 | 2004–2010 | |
| All serotypes | 20 (100%) | 12 (100%) | 17 (100%) | 49 | 68 | 25 | 0.51 (0.06) |
| PCV7 types | 6 (30%) | 1 (8%) | 2 (12%) | 15 | 5.5 | 3 | 0.20 (0.07) |
| PPSV23 types (not included in PCV7) | 14 (70%) | 10 (84%) | 9 (53%) | 34 | 57 | 13 | 0.39 (0.04) |
| Serotype 1 | 12 (60%) | 10 (84%) | 1 (6%) | 29 | 57 | 1.5 | 0.05 (<0.01) |
| Serotype 19A | 0 (0%) | 0 (0%) | 2 (12%) | 0 | 0 | 3 | +∞† (0.78) |
| Others | 2 (10%) | 0 (0%) | 6 (35%) | 5 | 0 | 8.5 | 1.8 (0.73) |
| Non-PCV7 or PPSV23 types | 0 (0%) | 1 (8%) | 6 (35%) | 0 | 5.5 | 9 | +∞† (0.12) |
†
No case occurred during the period from 1997 to 2001, so by definition the rate ratio is infinite.