Laboratory findings
Of 7 studies reporting data on blood tests, lymphocyte count was
revealed in all 7 studies[15, 17, 18, 22, 23, 26, 27]. With pooled
WMD of -0.42 (95 % CI: -0.64 to -0.20), it was revealed that severe
Covid-19 case was more likely to have decreased lymphocyte count when
compared with non-severe case (P=0.0002). However, no significant
difference was found in leucocytes[15, 17, 22, 23, 27],
neutrophils[15, 17, 22, 23, 26, 27] and monocyte count[15, 17,
27]. The outcome was explicitly expressed in Table 2.