TIDieR step	Item description	See manuscript page(s)
1) Brief name	Provide the name or a phrase that describes the intervention.	1235
2) Why	Describe any rationale, theory, or goal of the elements essential to the intervention.	1235-1237
3) What (materials)	Describe any physical or informational materials used in the intervention, including those provided to participants or used in intervention delivery or in training of intervention providers. Provide information on where the materials can be accessed (for example, online appendix, URL).	1238-1242, Appendix B
4) What (procedures)	Describe each of the procedures, activities, and/or processes used in the intervention, including any enabling or support activities.	1238-1242
5) Who provided	For each category of intervention provider (for example, psychologist, nursing assistant), describe their expertise, background, and any specific training given.	1241
5a) Who received a	Describe the intended participants of the intervention.	1239-1240
6) How	Describe the modes of delivery (such as face-to-face or by some other mechanism, such as Internet or telephone) or the intervention and whether it was provided individually or in a group.	1239, 1242
7) Where	Describe the type(s) of location(s) where the intervention occurred, including any necessary infrastructure or relevant features.	1240
8) When and how much	Describe the number of times the intervention was delivered and over what period of time including the number of sessions, their schedule, and their duration, intensity, or dose.	1241
9) Tailoring	If the intervention was planned to be personalized, titrated, or adapted, then describe what, why, when, and how.	1240
10) Modifications	If the intervention was modified during the course of the study, described the changes (what, why, when, and how)	1243
11) How well (planned)	If intervention adherence or fidelity was assessed, describe how and by whom, and if any strategies were used to maintain or improve fidelity, describe them.	1242, Appendix B
12) How well (actual)	If intervention adherence or fidelity was assessed, describe the extent to which the intervention was delivered as planned.	1242

Note. Adapted from Hoffmann et al. (2014, Appendix C).

^a Not included in the original TIDieR checklists.