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Table 1 Demographic and clinical characteristics of enrolled patients with ARIs in North China, 2012–2015

From: Comparison of the prevalence of respiratory viruses in patients with acute respiratory infections at different hospital settings in North China, 2012–2015

Characteristics

All patients (n = 9924), no. (%)

Hospital settings

Outpatient/ED,

(n = 6437), no. (%)

Hospitalized,

(n = 3487), no. (%)

P-value

Male

5362 (54.0)

3329 (51.7)

2033 (58.3)

< 0.001

Age, median years (IQR)

25.5 (6.6–44.3)

28.2 (15.6–42.1)

8.8 (3.0–52.0)

< 0.001*

Age in years

   

< 0.001

 0–1

1014 (10.2)

272 (4.2)

742 (21.3)

 

 2–4

983 (9.9)

519 (8.1)

464 (13.3)

 

 5–14

1610 (16.2)

760 (11.8)

850 (24.4)

 

 15–34

3070 (30.9)

2746 (42.7)

324 (9.3)

 

 35–64

2240 (22.6)

1735 (27.0)

505 (14.5)

 

  ≥ 65

1007 (10.1)

405 (6.3)

602 (17.3)

 

Surveillance year

   

< 0.001

 2012

2517 (25.4)

1804 (28.0)

713 (20.4)

 

 2013

2288 (23.1)

1201 (18.7)

1087 (31.2)

 

 2014

3198 (32.2)

2100 (32.6)

1098 (31.5)

 

 2015

1921 (19.4)

1332 (20.7)

589 (16.9)

 

Season of illness onset a

   

< 0.001

 winter

2810 (28.3)

1510 (23.5)

712 (20.4)

 

 spring

2462 (24.8)

1789 (27.8)

1021 (29.3)

 

 summer

2222 (22.4)

1528 (23.7)

934 (26.8)

 

 autumn

2430 (24.5)

1610 (25.0)

820 (23.5)

 

Clinical diagnosis

   

< 0.001

 URTIs b

5230 (52.7)

5069 (78.7)

161 (4.6)

 

 LRTIs c

4694 (47.3)

1368 (21.3)

3326 (95.4)

 

 Pneumonia d

4208 (42.4)

1134 (17.6)

3074 (88.2)

 

 Other LRTIs

486 (4.9)

234 (3.6)

252 (7.2)

 
  1. *. Wilcoxon test
  2. a. spring = March to May; summer = June to August; autumn = September to November; winter = December to February
  3. b. URTIs = upper respiratory tract infections, classified when common cold, rhinitis, pharyngitis, laryngitis or otitis media were diagnosed by attending physicians
  4. c. LRTIs = lower respiratory tract infections, classified when pneumonia, bronchiolitis, bronchitis or exacerbations of chronic obstructive pulmonary disease and asthma were diagnosed
  5. d. Pneumonia: chest X-ray showing evidence of consolidation (a dense or fluffy opacity with or without air bronchograms), other infiltrate (linear and patchy alveolar or interstitial densities), or pleural effusion