2. Egger test for small study bias: Egger's test regression coefficients and 95% CI for outcomes 1.1 to 1.7.

Outcome	N studies	Egger's test regression coefficient	Standard error	CI lower bound	CI upper bound	P‐value
Anxiety	15	−0.97	0.61	−2.28	0.34	0.13
Depression	34	−1.23	0.33	−1.91	−0.55	< 0.001
Mixed anxiety and depression	8	−0.28	0.58	−1.7	1.13	0.64
Stress	4	−3.08	1.69	−10.37	4.21	0.21
Positive affect	13	1.98	0.31	1.3	2.65	< 0.001
Psychological quality of life	19	0.72	0.4	−0.11	1.56	0.09
Social	9	0.47	0.41	−0.51	1.44	0.29