Table 4 Quality of included studies

Oken et al. (2010) [21]

AS (+)

AC (+)

PK (+)

IO (?)

Manual (+)

Training (+)

Integrity check (?)

Barrett et al. (2012) [33]

AS (+)

AC (+)

PK (-)

IO (+)

Manual (+)

Training (+)

Integrity check (?)

Creswell et al. (2012) [35]

AS (+)

AC (+)

PK (-)

IO (+)

Manual (+)

Training (+)

Integrity check (?)

Gallegos et al. (2013) [36]

AS (+)

AC (+)

PK (-)

IO (+)

Manual (+)

Training (?)

Integrity check (?)

Rosenkranz et al. (2013) [37]

AS (+)

AC (+)

PK (+)

IO (?)

Manual (+)

Training (+)

Integrity check (?)

Hayney et al. (2014) [34]

AS (+)

AC (+)

PK (+)

IO (?)

Manual (+)

Training (+)

Integrity check (?)

Johnson et al. (2014) [22]

AS (+)

AC (+)

PK (-)

IO (+)

Manual (+)

Training (?)

Integrity check (?)

Carlson et al. (2003) [31]

AS (-)

AC (-)

PK (-)

IO (+)

Manual (+)

Training (?)

Integrity check (?)

Carlson et al. (2007) [32]

AS (-)

AC (-)

PK (-)

IO (+)

Manual (+)

Training (?)

Integrity check (?)

Witek-Janusek et al. (2008) [38]

AS (-)

AC (-)

PK (-)

IO (?)

Manual (+)

Training (+)

Integrity check (?)

Lengacher et al. (2012) [39]

AS (-)

AC (-)

PK (-)

IO (?)

Manual (+)

Training (+)

Integrity check (?)

Lengacher et al. (2013) [40]

AS (+)

AC (+)

PK (-)

IO (?)

Manual (+)

Training (+)

Integrity check (?)

Bower et al. (2015) [23]

AS (+)

AC (+)

PK (?)

IO (-)

Manual (+)

Training (?)

Integrity check (?)