Blood-culture-positive pneumococcal pneumonia | Blood-culture-negative pneumococcal pneumonia | p-value | |
Subjects | 362 | 555 | |
Mechanical ventilation | 0.30 | ||
No | 289 (86) | 444 (87) | 0.56 |
NIMV | 16 (5) | 14 (3) | 0.12 |
IMV | 31 (9) | 50 (10) | 0.77 |
LOS days | 9 (5–14) | 7 (4–10) | <0.001 |
ICU mortality# | 12 (14) | 20 (20) | 0.27 |
30-day mortality | 27 (8) | 27 (5) | 0.12 |
Before 2007¶ | 19 (8) | 18 (5) | 0.16 |
After 2007+ | 8 (9) | 9 (6) | 0.49 |
Data are presented as n, n (%) or median (interquartile range), unless otherwise stated. Percentages calculated on nonmissing data. NIMV: noninvasive mechanical ventilation; IMV: invasive mechanical ventilation; LOS: length of hospital stay; ICU: intensive care unit. #: 88 patients in the bacteraemic pneumococcal pneumonia group and 102 patients in the nonbacteraemic pneumococcal pneumonia group were used to calculate the percentages; ¶: percentages calculated for patients included before 2007 (240 patients in the bacteraemic pneumococcal pneumonia group, and 353 patients in the nonbacteraemic pneumococcal pneumonia group); +: percentages calculated for patients included after 2007 (93 patients in the bacteraemic pneumococcal pneumonia group and 144 patients in the nonbacteraemic pneumococcal pneumonia group).