Table 1. Cognitive, behavioural and emotional health scores and their interpretations.

Psychological and behavioural scales	Score range and interpretation
Edinburgh Postnatal Depression Scale (EPDS) [29]	As a continuous measure (0–30), where a higher score indicates a higher probability of depression
	OR
	As a categorical variable with the following 3 categories
	1.EPDS <5: unlikely to experience depression post partum
	2.EPDS 5–9: increased risk of depression in the next year
	3.EPDS >9: very likely depressed
	0–40, with high scores representing higher perceived stress
Perceived Stress Scale [27]	Two subscales:
	1.Limiting/resting behaviour (0–20)
	2.All-or-Nothing behaviour (0–28)
Behavioural Responses to Pregnancy (adapted from the Behavioural Response to Illness Questionnaire [30])	6–24, with high scores indicating high state anxiety
Short form State-Trait Anxiety Inventory [26]