Table 2. Subgroup analyses of prevalence of psychological distress in patients with breast cancer.

Subgroup	No of included studies	Prevalence (%)	95%CI	I2 (%)	P value
Tool
DT	10	63	0.50 to 0.74	97	<0.01
HADS	8	41	0.31 to 0.52	96	<0.01
DT+PL	3	27	0.17 to 0.37	97	<0.01
DASS	3	60	0.34 to 0.84	98	<0.01
Country
Developed country	15	47	0.37 to 0.58	98	<0.01
Developing country	11	53	0.40 to 0.66	99	<0.01
Sample
≥400	11	49	0.38 to 0.60	99	<0.01
<400	16	51	0.39 to 0.62	97	<0.01
Period
Before COVID-19	16	48	0.38 to 0.58	98	<0.01
After COVID-19	11	53	0.38 to 0.67	99	<0.01

DTDistress ThermometerHADSHospital Anxiety and Depression ScalePLproblem list