Table 3.
Comparison of patients with pneumococcal pneumonia caused by penicillin-resistant strains in early and contemporary isolates according to their age and risk stratum.
| Early isolates (2002–2004) |
Contemporary isolates (2005–2007) |
||||
|---|---|---|---|---|---|
| Strata | Overall strains | Penicillin-resistant strains | Overall strains | Penicillin-resistant strains | P-value* |
| Age | |||||
| 50–74 yrs | 17 | 7(41.2) | 42 | 2 (4.8) | 0.001 |
| 75 yrs or more | 21 | 8 (38.1) | 24 | 10 (41.7) | 0.807 |
| Risk strata | |||||
| High | 11 | 4 (36.4) | 20 | 6 (30) | 0.717 |
| Moderate | 20 | 8 (40) | 26 | 2 (7.7) | 0.008 |
| Low | 7 | 3 (42.9) | 20 | 4 (20) | 0.235 |
| Overall | 38 | 15 (39.5) | 66 | 12 (18.2) | 0.017 |
NOTE: Data are numbers (percentage) of subjects.
* P-values were calculated by using Student's t test for continuous variables and chi-squared or Fisher's test for categorical variables, as appropriate.