Fig. 5
From: The laboratory findings and different COVID-19 severities: a systematic review and meta-analysis
Forest plot showing pooled mean of leukocyte count between groups according O2 therapy manner: (1) invasive ventilation group (pooled average of 7.84 × 109 per liter, CI = [6.94, 8.73], p < 0.001), (2) No oxygen therapy group (pooled average of 5.27 × 109 per liter), CI = [4.87,5.67] (3) Noninvasive O2 therapy group(pooled average of 6.45 × 109 per liter), CI = [5.60, 7.39]