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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
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