Table 1 Characteristics of study patients by presence/absence of pneumonia

p-value

Gender

<.0001

 Male: N (%)

3095

(47.74%)

2479

(45.87%)

616

(57.09%)

Age classes

<.0001

 14 ≤ Age < 45 years: N (%)

1781

(27.47%)

1672

(30.94%)

109

(10.10%)

 45 ≤ Age < 55 years: N (%)

1387

(21.39%)

1200

(22.21%)

187

(17.33%)

 55 ≤ Age < 65 years: N (%)

1316

(20.30%)

1076

(19.91%)

240

(22.24%)

 65 ≤ Age < 75 years: N (%)

963

(14.85%)

743

(13.75%)

220

(20.39%)

 Age ≥ 75 years

1036

(15.98%)

713

(13.19%)

323

(29.97%)

Smoking status^a

<.0001

 Never smoked: N (%)

3635

(86.24%)

2987

(85.22)

648

(91.27%)

 Ever smoked: N (%)

580

(13.76%)

518

(14.78%)

62

(8.73%)

 Hypertension: N (%)

1821

(28.09%)

1405

(26.00%)

416

(38.55%)

<.0001

 Diabetes: N (%)

537

(8.28%)

388

(7.18%)

149

(13.81%)

<.0001

 Asthma: N (%)

319

(4.92%)

252

(4.66%)

67

(6.21%)

0.0320

 Obesity^b: N (%)

765

(11.80%)

594

(10.99%)

171

(15.85%)

<.0001

 COPD: N (%)

420

(6.48%)

323

(5.98%)

97

(8.99%)

0.0002

 CAD: N (%)

297

(4.58%)

220

(4.07%)

77

(7.14%)

<.0001

 CVD: N (%)

309

(4.77%)

236

(4.37%)

73

(6.77%)

0.0007

 0: N (%)

3664

(56.52%)

3200

(59.22%)

465

(43.00%)

<.0001

 1: N (%)

1652

(25.48%)

1340

(24.80%)

312

(28.92%)

 2: N (%)

791

(12.20%)

585

(10.83%)

206

(19.09%)

 3+: N (%)

376

(5.80%)

279

(5.16%)

97

(8.99%)

 Mean (SD)

24.06

(7.31)

23.59

(7.22)

26.40

(7.32)

<.0001

 Median (Q1; Q3)

23.40

(17.78; 30.38)

22.94

(17.52; 29.74)

28.56

(20.30; 32.45)