Table 3.

Results of heterogeneity among included studies

Variable	Sub-groups	#No. of studies	Event rate (%) 95% CI	Q-value	Df (Q)	I${}^2$	P-value	Selected model
Signs and symptoms	Cough	9	35.5, (23.1-50.2)	13.93	8	42.60	0.083	Random
	Diarrhea	6	7.6 (3.3-16.5)	2.65	5	0.0	0.754	Random
	Dyspnea	9	14.6 (9.2-22.3)	2.55	8	0.0	0.895	Random
	Fatigue	3	14.9 (7-29.1)	2.79	2	28.52	0.247	Random
	Fever	10	66.8 (48.3-81.2)	26.63	9	66.2	0.002	Random
	Myalgia	3	24.6 (12.1-43.5)	0.59	2	0.0	0.744	Random
	Sore throat	4	11.5(4.8-25.1)	1.71	3	0.0	0.633	Random
	Post-partum fever	4	37.1 (18.5-60.6)	6.01	3	60.1	0.016	Random
Laboratory tests	Lymphopenia	7	49.8 (30.1-69.6)	17.59	6	65.90	0.007	Random
	Leukocytosis	4	47.7 (31.6-64.2)	4.57	3	34.38	0.206	Random
	Elevated neutrophil ratio	3	83.7 (72.3-91.0)	0.236	2	0.0	0.889	Random
	Elevated C-reactive protein	7	57 (43.7-69.3)	8.89	6	32.53	0.180	Random
	Decreased lymphocyte ratio	3	71.4 (16.4-96.9)	19.47	2	89.73	$<$0.001	Random
Type of delivery	Cesarean	10	84 (74.0-90.7)	9.76	9	7.84	0.370	Random
NR: Not reported; CI: Confidence interval; DF (Q): Degrees of freedom (Cochran's Q); I${}^2$: I square