TABLE 3.

COM‐B construct and TDF domains by importance criteria

COM‐B	TDF domain, definition (component constructs)	Relevance at the personal level	Importance criteria		Importance assessment
			Freq a	Elab b
Capability (Psychological)	Knowledge	(Lack of) knowledge of link between postpartum health behaviours and future type 2 diabetes risk (Lack of) knowledge of specific health behaviour recommendations to prevent future type 2 diabetes risk	20 (57)	2	High
	Memory, attention and decision processes	Forgetting health behaviour recommendations Deciding not to take up postpartum health behaviour recommendations	9 (26)	4	Low
	Behavioural regulation	Planning and engaging with postpartum health behaviour recommendations Sustaining lifestyle changes made during pregnancy	18 (51)	2	High
Capability (Physical)	Skills	Not relevant (although postpartum health behaviours could be acquired through practice, e.g. learning to cook a healthy meal, this was not reported in the included studies)	0 (0)	0	N/A
Opportunity (Physical)	Environmental context and resources (EC&R)	Environmental barriers (competing demands, lack of cultural‐specific resources, environment of facilities [e.g. not feeling safe], accessibility, socio‐economic)	22 (63)	8	High
Opportunity (social)	Social influences	Finding value in the health advice of healthcare professionals Social/emotional, pragmatic and peer support from family and friends to enable healthy behaviours Respecting the social norms of women's cultural group	32 (91)	5	High
Motivation (Automatic)	Reinforcement	Previous experience of OGTT and GDM management during pregnancy	7 (20)	2	Low
	Emotion	Fear and anxiety of being diagnosed with future type 2 diabetes as a motivator of healthy behaviours Impact of early parenthood and migrant experience on emotions including postpartum abandonment	15 (43)	3	High
Motivation (Reflective)	Beliefs about consequences	Beliefs about the consequences of (not) following healthy behaviours on women's lives Beliefs about the importance of healthy behaviours for reducing future type 2 diabetes risk Cultural beliefs, norms or myths about healthy eating and exercise in the postpartum period	24 (69)	6	High
	Social/Professional Role and Identity	Placing one's healthcare needs secondary to those of the newborn, and secondary to family and cultural norms and needs	17 (49)	2	High
	Beliefs about capabilities	Perceived (in)ability to manage type 2 diabetes risk; perceived inevitability of type 2 diabetes Lack of confidence in capability to adhere to follow postpartum health behaviours	16 (46)	4	High
	Optimism	Low perceived personal susceptibility to type 2 diabetes	9 (26)	1	Low
	Goals	Setting goals relevant to postpartum health behaviours (e.g. being healthy for children, reduce weight)	11 (31)	1	Low
	Intentions	Intentions to engage in/maintain healthy behaviour recommendations	1 (3)	1	Low

^a Number of studies identified (%).

^b Number of themes.