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Table 1 Demographic characteristics of 35,297 pneumonia patients

From: Development of a risk-adjusted in-hospital mortality prediction model for community-acquired pneumonia: a retrospective analysis using a Japanese administrative database

 

Overall

30-day in-hospital survival cases

30-day in-hospital mortality cases

 

Number of hospitals

N = 303

     

Patient characteristics

n = 35,297

n = 33,256

n = 2,041

P

Median age, year (IQR)

78

(68–86)

78

(67–85)

85

(79–90)

< 0.001a

Male, no. (%)

20,667

(58.6)

19,359

(58.2)

1308

(64.1)

< 0.001b

Median BMI, kg/m2 (IQR)

20.7

(18.2-23.5)

20.8

(18.3-23.6)

19.1

(16.6-21.7)

< 0.001a

BUN ≥7.5 mmol/L or Dehydration, no. (%)

12,623

(35.8)

11,183

(33.6)

1,440

(70.6)

< 0.001b

SpO2 < 90%, no. (%)

11,753

(33.3)

10,423

(30.8)

1,510

(74.0)

< 0.001b

Orientation disturbance, no. (%)

6,116

(17.3)

5,189

(15.6)

927

(45.4)

< 0.001b

Systolic BP ≤90 mmHg, no. (%)

2,038

(5.8)

1,507

(4.5)

531

(26.0)

< 0.001b

CRP 200 mg/L or extent of consolidation on chest X-ray ≥2/3 of one lung, no. (%)

6,333

(17.9)

5,423

(16.3)

910

(44.6)

< 0.001b

Comorbidities, no. (%)

 Cancer

4,154

(11.8)

3,800

(11.4)

354

(17.3)

< 0.001b

 Liver disease

242

(0.7)

229

(0.7)

13

(0.6)

0.784b

 Renal disease

1,558

(4.4)

1,407

(4.2)

151

(7.4)

< 0.001b

 Congestive heart failure

5,435

(15.4)

4,877

(14.7)

558

(27.3)

< 0.001b

 Cerebrovascular disease

3,002

(8.5)

2,819

(8.5)

183

(9.0)

0.442b

 Immune deficiency

2,404

(6.8)

2,167

(6.5)

237

(11.6)

< 0.001b

Emergency admission via ambulance, no. (%)

9,418

(26.7)

8,320

(25.0)

1,098

(53.8)

< 0.001b

Life support procedure, no. (%)

 Mechanical ventilatorc

795

(2.3)

514

(1.5)

281

(13.8)

< 0.001b

 Vasopressorc

552

(1.6)

305

(0.9)

1247

(12.1)

< 0.001b

 Hemodialysisc

396

(1.1)

361

(1.1)

35

(1.7)

0.003b

  1. a P values by Mann–Whitney U test. b P values by chi-squared test.
  2. cVentilator and vasopressor treatments were started within 2 days of admission. Hemodialysis was started within 3 days of admission.
  3. Abbreviations: IQR, interquartile range; BMI, body mass index; BUN, blood urea nitrogen; SpO2, pulse oximetry saturation; BP, blood pressure; CRP, C-reactive protein.
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BMC Pulmonary Medicine

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