Table 1.

Participant flow by group

	Groups
	Insert only	Atheoretical outsert	TPB outsert	Insert and atheoretical outsert	Insert and TPB outsert	Control
Allocated and invited	252	252	252	252	252	252
Baseline return	96	104	98	110	106	118
Follow-up return	65	76	76	86	76	89
Excluded listwise (missing data)	9	4	6	6	8	9
Included in analysis	56	72	70	80	68	80