Table 1 Methodological Quality of the Studies

Study Purpose

Was the purpose stated clearly?

Y

Y

Y

Y

Literature

Was relevant background literature reviewed?

Y

Y

Y

Y

Design

RCT

RCT

RCT

RCT

Sample description

Was the sample described in detail?

Y

Y

Y

Y

Sample size justification

Was sample size justified?

Y

N

N

N

Reliable measures

Were the outcome measures reliable?

Y

Y

Y

Y

Cronbach’s α were reported

Cronbach’s α were reported

Cronbach’s α were reported

Cronbach’s α were reported

Valid measures

Were the outcome measures valid?

Validity was reported in a prior study

Y

Y

Y

Y

FSDS-R: construct validity

HADS & IIRS: discriminant validity

IIEF: validated in 32 languages

FSFI: reported convergent and discriminant validity

BSI-18: incremental validity

A-DAS: discriminant validity

FSFI: reported convergent and discriminant

MSIQ: construct validity

BSI-18: incremental validity

QLACS: convergent validity

IIEF: validated in 32 languages

DASS-21: convergent validity

KMS & DSC: discriminant validity

Intervention description

Intervention was described in detail?

Y

Y

Y

Y

Contamination

Clients in the control group did not receive treatment inadvertently?

Y

Y

Y

Y

Cointervention

Cointervention was avoided?

Y

Y

Y

Y

Reporting results

Results were reported in terms of statistical significance?

Y

Y

Y

Y

Analysis methods

Were the analysis method(s) appropriate?

Y

Y

Y

Y

Clinical importance

Clinical importance was reported?

Y

Y

Y

Y

Drop-outs

Drop-outs were reported?

Y

Y

Y

Y

Conclusion and Implications

Conclusions were appropriate given study methods and results

Y

Y

Y

Y