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Table 1 Patient demographics (9-year)*

From: Capturing the trends in hospital standardized mortality ratios for pneumonia: a retrospective observational study in Japan (2010 to 2018)

Characteristics 2010–2018 (n = 230,372)
AliveDeadP value
Demographic features
 Age (years)Mean ± SD60.0 ± 34.985.1 ± 8.9< 0.001
Median (IQR)77 (22, 86)86 (81, 91)< 0.001††
 Sex (male) 113,530 (54.6)13,297 (59.6)< 0.001
Comorbidity
 CCIMean ± SD3.4 ± 2.35.2 ± 1.6< 0.001
Median (IQR)4 (1, 5)5 (4, 6)< 0.001††
Admission features
 LOS (days)Mean ± SD18.1 ± 22.637.3 ± 67.3< 0.001
Median (IQR)11 (7, 21)21 (9, 44)< 0.001††
 Emergency admission 204,057 (97.9)21,208 (97.4)< 0.001
 Ambulance usage 52,869 (25.4)10,566 (47.4)< 0.001
Severity status
 A-DROP score 0 109,504 (52.6)8693 (38.9)< 0.001
 A-DROP score 1 68,681 (33.0)4927 (22.1)
 A-DROP score 2 17,386 (8.4)3686 (16.5)
 A-DROP score 3 12,482 (6.0)5013 (22.5)
  1. *Values in parentheses are %
  2. T test
  3. ††Mann-Whitney U test
  4. Chi-square test
  5. CCI Charlson comorbidity index, LOS length of stay