Assessment of included studies based on two components of the Medical Research Council11 criteria for complex interventions
| Authors | Theoretical quality | Standardisation of delivery |
|---|---|---|
| A Warrens, personal communication, 2013 | Minimally grounded | Authors allow for and explain variation in intervention delivery Standard training offered to educators delivering intervention |
| Allen and Stillwater26 | Minimally grounded | Authors indicate variation |
| Alvaro et al31 | Moderately grounded | Strict standardisation (due to intervention design) |
| Alvaro et al20 | Well grounded | Strict standardisation—authors undertook unannounced site visits and developed standard reporting tools for completion at intervention sites |
| Andrews et al13 | Moderately grounded | Authors indicate variation |
| Arriola et al14 | Well grounded | Strict standardisation |
| Callender et al25 | Well grounded | Authors indicate variation |
| Cárdenas et al18 | Moderately grounded | Strict standardisation |
| Thornton et al17 | No theoretical grounding | Strict standardisation |
| Fahrenwald et al28 | Well grounded | Strict standardisation |
| Feeley et al19 | Moderately grounded | Authors allow for and explain variation |
| Frates et al29 | Moderately grounded | Strict standardisation (due to intervention design) |
| Harrison et al15 | Well grounded | Strict standardisation of media and print info. Variation but no explanation or assessment of variation in interpersonal elements |
| Hebert et al32 | Moderately grounded | Strict standardisation (due to intervention design) |
| Radosevich et al15 | Moderately grounded | Strict standardisation due to intervention design) |
| Resnicow et al12 | Moderately grounded | Strict standardisation. Standard training offered to educators delivering intervention |
| Salim et al30 | Minimally grounded | Strict standardisation (due to intervention design) |
| Salim et al24 | Minimally grounded | Strict standardisation |