Table 3.

Process evaluation items, indicators, and methods of measurement

Process evaluation items		Indicators	Measurement
Implementation
Dose	Quantity of the intervention implemented	Number of sessions received Frequency and duration of exercising with the exercise video	Intervention logbook; WeChat record
Reach	How well the intervention is received	Percentage of pregnant women who met the inclusion criteria attend this study Percentage of participants who completed the intervention	Intervention logbook; WeChat record
Fidelity	Whether the intervention was delivered to participants according to the protocol	If the session was delivered to participants, gestational weeks, begin-time, complete-time; if the session was completed, reasons for participation and declining participation	Intervention logbook; WeChat record; semi-structured interviews
Adaptation	Extent to which adaptation across contents is acceptable	Satisfactory rate	Satisfactory questionnaire; Semi-structured interviews
Mechanism of impact
Participant responses	Participant responses to and interactions with the intervention	How satisfied are participants with the content, work procedures, and delivery? What is their opinion of the physical activity program’s appropriateness/usefulness, acceptability, feasibility, sustainability?	Satisfactory questionnaire; Semi-structured interviews
Context	Which factors/circumstances have either facilitated or hindered working with the interventions?	Which factors/circumstances have either facilitated or hindered working with physical activity programs?	Semi-structured interviews.