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Table 1 Characteristics of enrolled pneumonia patients

From: The impact of virus infections on pneumonia mortality is complex in adults: a prospective multicentre observational study

  Total No comorbidity Chronic respiratory disease Other comorbiditiesa P value†
  N = 2617 N = 574 N = 790 N = 1253  
  N (%) N (%) N (%) N (%)  
Male sex 1591 (60.8) 295 (51.4) 540 (68.4) 756 (60.3) <0.001
Age group
 15–64 580 (22.2) 268 (46.7) 121 (15.3) 191 (15.2) <0.001
 65–74 447 (17.1) 91 (15.9) 141 (17.9) 215 (17.2)  
 75–84 848 (32.4) 126 (22.0) 321 (40.6) 401 (32.0)  
 85+ 742 (28.4) 89 (15.5) 207 (26.2) 446 (35.6)  
Admission 2007 (76.7) 305 (53.1) 597 (75.6) 1105 (88.2) <0.001
Performance status ≥3, n = 1307 310 (23.7) 37 (11.1) 56 (13.9) 217 (37.9) <0.001
Severe disease (CURB65 ≥ 4), n = 2100 154 (7.3) 19 (4.5) 41 (6.7) 94 (8.9) 0.010
Duration of symptomsb > 3 days, n = 2507 874 (34.9) 256 (47.8) 251 (33.3) 367 (30.2) <0.001
No. of symptoms ≥3 1664 (63.6) 390 (67.9) 554 (70.1) 720 (57.5) <0.001
Aspiration risk, n = 2545 1189 (46.7) 103 (18.4) 293 (37.8) 793 (65.5) <0.001
Period
 Spring (January to March) 645 (24.7) 129 (22.5) 195 (24.7) 321 (25.6) 0.092
 Summer (April to June) 572 (21.9) 147 (25.6) 161 (20.4) 264 (21.1)  
 Autumn (July to September) 641 (24.5) 151 (26.3) 189 (23.9) 301 (24.0)  
 Winter (October to December) 759 (29.0) 147 (25.6) 245 (31.0) 367 (29.3)  
Study site
 Ebetsu 326 (12.4) 79 (13.8) 123 (15.6) 124 (9.9) <0.001
 Kamogawa 1379 (52.7) 348 (60.6) 416 (52.7) 615 (49.1)  
 Kochi 600 (22.9) 96 (16.7) 153 (19.4) 351 (28.0)  
 Nagasaki 312 (11.9) 51 (8.9) 98 (12.4) 163 (13.0)  
  1. †Chi-square tests were performed to compare three groups
  2. aOther comorbidities include diabetes mellitus, cerebrovascular disease, dementia, neuromuscular disease, cardiac failure, ischaemic heart disease, collagen disease, malignancy, renal disease, and liver disease
  3. bSymptoms include cough, sputum, chest pain, fever, chill, headache, fatigue, appetite loss, myalgia, arthralgia, nausea, vomiting, diarrhoea, and dehydration