Healthy eating and lifestyle in pregnancy (HELP): a protocol for a cluster randomised trial to evaluate the effectiveness of a weight management intervention in pregnancy

Table 2 Measurement of Mediators

Mediators	Measure	When
Social support	Social Support Exercise and Eating Habits Scales [89] (plus intervention specific social support questions)	B, 36w, 6 m, 12 m
Self-efficacy	Weight Efficacy Lifestyle Scale [90] and Multidimensional Self efficacy for Exercise Scale [91, 92]	B, 36w, 6 m, 12 m
Self-regulation	Shortened Self-Regulation Questionnaire [93]	B, 36w, 6 m, 12 m
Motivation	Treatment Self-Regulation Questionnaire (for diet and physical activity) [94]	B, 36w, 6 m, 12 m

(B = baseline; 36w = 36 weeks gestation; 6 m = 6 months postpartum; 12 m =12 months postpartum).

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