Table 13 Articles reporting significant improvement of anxiety after intervention

Kind of intervention

 Self-help tool (n = 18)

5 (28%)

[20, 39, 52, 58, 67]

 Support (n = 3)

3 (100%)

[46, 69, 77]

Intervention target

 Preventing stress/mental health impairment (n = 5)

3 (60%)

[46, 58, 77]

 Symptom reduction (n = 11)

4 (36%)

[20, 39, 52, 69]

 Main intervention target was not in the field of mental health (n = 2)

1 (50%)

[67]

Intervention contents

 iCBT (n = 8)

4 (50%)

[20, 39, 52, 58]

 Education lessons (n = 5)

1 (20%)

[67]

 Mindfulness (n = 3)

1 (33%)

[69]

 Peer support (n = 2)

2 (100%)

[46, 77]

Delivery mode

 Internet intervention: website (n = 15)

5 (33%)

[20, 39, 52, 58, 69]

 Telephone (n = 1)

1 (100%)

[46]

 Telephone and app (n = 1)

1 (100%)

[67]

 Telephone, emails or other messengers (n = 1)

1 (100%)

[77]

Personal contacts

 Yes (n = 13)

6 (43%)

[20, 46, 52, 67, 69, 77]

 No (n = 8)

2 (25%)

[39, 58]