Table 2.

The pooled prevalence rates of mental health symptoms by subgroups of population, outcome, and severity

First‐level subgroup	Second‐level subgroup	Prevalence (%)	95% CI	I2 (%)	P value
Overall		20%	16%–23%	99.2%	0.00
Population	Frontline HCW	18%	12%–25%	98.3%	0.00
	General HCW	17%	13%–21%	97.9%	0.00
	General population	27%	19%–35%	99.7%	0.00
	Student	20%	11%–30%	99.2%	0.00
Outcome	Anxiety	22%	18%–27%	99.3%	0.00
	Depression	16%	12%–20%	99.9%	0.00
	Insomnia	19%	1%–23%	99.3	0.00
Severity	Mild	26%	21%–31%	98.9%	0.00
	Moderate	21%	16%–26%	98.6%	0.00
	Severe	7%	6%–9%	93.7%	0.00
Study Quality	High quality	16%	11%–21%	98.5%	0.00
	Medium quality	21%	17%–25%	99.3%	0.00
Subregion	Continental	20%	16%–23%	99.2%	0.00
	Malay Archipelago	18%	8%–31%	98.9%	0.00

I² statistic indicates the heterogeneity. Some I² values in Tables 2 and 3 are missing because the total sample is less than 3.

CI, confidence interval.