Assessing effective interventions to improve trial retention: do they contain behaviour change techniques?

Table 2 Summarised behaviour change technique coding for the interventions tested in the included studies

BCT grouping	BCT reference	BCT name	Trials								Frequency of BCTs across intervention
			Electronic prompts			Monetary incentives
			Ashby [10]	Clark [4]	Man [11]	Bauer [6]	Gates [7]	Kenyon [8]	Khad. 1 [9]	Khad. 2 [9]
Social support	3.2	Social support (practical)		++		++	++				3
Shaping knowledge	4.1	Instruction on how to perform the behaviour		++	++	++	++		++	++	6
Natural consequences	5.1	Information about health consequences		++							1
Natural consequences	5.3	Information about social and environmental consequences					++		++	++	3
Associations	7.1	Prompts/cues	++	++	++	++	++	++	++	++	8
Comparison of outcomes	9.1	Credible source		++			++				2
Reward and threat	10.1	Material incentive (behaviour)			++						1
	10.2	Material reward (behaviour)				+	+	+			3
	10.8	Incentive (outcome)							+	+	2
	10.10	Reward (outcome)							+	+	2
Antecedents	12.5	Adding objects to the environment		++	++	++	++	++			5
Total number of BCTs identified per study			1	6	4	5	7	3	5	5

ISSN: 1745-6215