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Table 3 Radiological, and analytical findings on admission in patients ≥ 80 years hospitalized with COVID-19 during the first and successive waves

From: Differences in clinical features and mortality in very old unvaccinated patients (≥ 80 years) hospitalized with COVID-19 during the first and successive waves from the multicenter SEMI-COVID-19 Registry (Spain)

  Total
N (%)
( n  = 5953)
First wave
N (%)
( n  = 4545)
Successive waves
N (%)
( n  = 1408)
p value
Chest X-ray findings      < 0.001
 Normal 1091 (18.7) 768 (17.3) 323 (23.1)  
 Unilateral infiltrates 1168 (20.0) 867 (19.5) 301 (21.5)  
 Bilateral infiltrates 3584 (61.3) 2807 (63.2) 777 (55.5)  
Laboratory findings
Arterial blood gases
 PO2/FiO2 ratio 277 (222–327) 273 (214–323) 289 (242–333)  < 0.001
Blood count & biochemistry
 Lymphocytes (× 103/μL) 0.88 (0.06–1.23) 0.88 (0.60–1.23) 0.87 (0.6–1.23) 0.532
 Lactate dehydrogenase (U/L) 322 (246–448) 330 (251–463) 302 (233–412)  < 0.001
 C-reactive protein (mg/L) 71.0 (24.0–138) 71.6 (23.5–143) 69.8 (27.8–128) 0.330
 D-dimer (ng/mL) 1.01 (0.55–2.02) 1.02 (0.54–2.02) 1.00 (0.55–2.01) 0.558
 Serum ferritin (μg/L) 445 (212–953) 484 (230–1013) 396 (189–856)  < 0.001
 Fibrinogen (mg/L) 598 (500–700) 607 (500–706) 564 (461–700)  < 0.001
  1. Statistically significant differences are indicated in bold