Table 2.

Presence of sustainment practices (definition and so on) in follow-up studies, reported by the sustainment period.

EBI (follow-up paper author, year)	Long-term follow-up planned Y/N (description)	Sustainment defined Y/N (reference)	Sustainment term used in original papers Y/N, term used (paper type, author, year)	Sustainment framework or theory used Y/N	Level of external support at the sustainment follow-up time point	Strategies reported at follow-up
Studies reporting at maintenance timepoint (6–12 months)
PACE (Nathan, 2022) (8)	Y (planned 6-month follow-up in this paper)	Y (Proctor et al.) (16)	Y, sustainability (Protocol, Nathan, 2019)	N	Lower than implementation	Online resources, telephone support
Bihar School Teachers Study (Sorensen 2013) (36)	Y (planned 6-month follow-up in implementation effect study)	N	Y, maintenance, (outcomes, Mathur, 2016) (41)	N	No ongoing support	None reported
Studies reporting at early sustainment timepoint (12–24 months)
PLAY (Farmer 2017) (38)	Y (planned 12-month follow-up in this paper)	N	N	N	No ongoing support	None reported
Wolfenden (Wolfenden 2019) (37)	N (long-term follow-up not mentioned in papers)	N	N	N	No ongoing support	None reported
SPARK (McKenzie 1997) (39)	N (long-term follow-up not mentioned in papers)	N	N	N	No ongoing support	None reported
Studies reporting at the sustainment timepoint (24 months or greater)
Nathan V&F (author supplied data 2024)	Y, repeated cross-sectional surveys (correspondence)	N	N	N	No ongoing support	None reported