Table 7.

Reasons participants provided for noncompletion of the treatment in the 17 studies where this information was described.

Reason	Study
	Boele et al [139], 2018	Boeschoten et al [121], 2017	Geraedts et al [74], 2014	Heller et al [87], 2020	Høifødt et al [138], 2013	Karyotaki et al [144], 2022	Kenter et al [137], 2016	Kleiboer et al [136], 2015	Lappalainen et al [132], 2015	Nadort et al [113], 2022	O’mahen et al [88], 2014	Pots et al [145], 2016	Preschl et al [134], 2011	Ström et al [81], 2013	Van der Zweerde et al [98], 2019	Wagner et al [135], 2014	Westerhof et al [79], 2019
No reason provided	✓a		✓	✓	✓		✓	✓						✓	✓	✓
Not meeting personal needs	✓	✓		✓	✓	✓	✓	✓		✓				✓		✓
Recovery	✓			✓	✓		✓	✓			✓		✓			✓
Preferred other treatment or part of the treatment	✓	✓		✓	✓			✓								✓
Technical difficulties	✓	✓				✓	✓	✓								✓
Lack of time	✓	✓	✓	✓	✓	✓		✓			✓	✓	✓	✓	✓
Motivation				✓		✓	✓	✓		✓	✓		✓			✓	✓
Personal problems or sickness	✓	✓			✓		✓		✓	✓		✓		✓	✓		✓

^a✓: indicates that at least one participant in the study stated the reason as a cause for treatment noncompletion.