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Table 4 In-hospital mortality for pneumonia patients by hospital case volume level, after stratification by A-DROP score calculated from the Pneumonia Severity Indices at admission, Japanese DPC database, 2010

From: Association between hospital case volume and mortality in non-elderly pneumonia patients stratified by severity: a retrospective cohort study

A-DROPScore    Hospital case volume level  
  Total* Very low (≤7) Low (8–11) Medium (12–17) High (≥18) p
0 N 4906 1027 1193 1283 1403 0.31
Deaths 29 9 6 7 7
% 0.6 0.9 0.5 0.6 0.5
1 N 1981 421 487 524 549 0.72
Deaths 61 6 22 20 13
% 3.1 1.4 4.5 3.8 2.4
2 N 701 158 184 176 183 0.01
Deaths 58 18 20 12 8
% 8.3 11.4 10.9 6.8 4.4
3 N 220 48 43 61 68 0.76
Deaths 52 14 7 15 16
% 23.6 29.2 16.3 24.6 23.5
4 N 120 34 34 28 24 0.36
Deaths 53 14 14 12 13
% 44.2 41.2 41.2 42.9 54.2
  1. p-value from Mantel-Haenszel chi-squared test for trend.
  2. *365 patients had missing value in at least one of the severity markers and were excluded from the table.