Table 1 Baseline characteristics of study population in Guangdong province, China during 2016–2019
Baseline Characteristic | Values |
|---|---|
Pneumonia hospital admissions, n (ICD-10 code: J12-J18) | 6473 |
Case days, n | 9431 |
Control days, n | 31,914 |
Sex, n (%) | |
 Male | 6438 (68.3) |
 Female | 2993 (31.7) |
Age at hospital admission | |
 Mean (SD) | 79.1 (8.6) |
 Median (IQR) | 80.0 (12.0) |
n (%) | |
 < 85 year | 6682 (70.9) |
 ≥ 85 year | 2749 (29.1) |
Season at hospital admission, n (%) a | |
 Warm | 4246 (45.0) |
 Cool | 5185 (55.0) |
No. of hospital admission, n | |
 1 | 4836 (74.7) |
 2 | 1021 (15.8) |
 ≥ 3 | 616 (9.5) |
Main type of pneumonia, n (%) | |
 Bacterial pneumonia (ICD-10 code: J15) | 3260 (34.6) |
 Pneumonia, organism unspecified (ICD-10 code: J18) | 6152 (65.4) |