Table 2 Indicators of acceptability

Recruitment

Do the eligible mothers accept to participate?

% of eligible mothers that participate.

Randomisation

Do the mothers accept to be randomized?

Reason of refusal.

Data collection

Is it acceptable for mothers that we perform EEGs to their preterm infant?

80% of mothers accept.

Is it acceptable for mothers that we perform the GMA to their preterm infant?

80% of mothers accept.

Is it acceptable for mothers to be filmed while they breastfeed or bottle-feed?

80% of mothers accept.

Is it acceptable for mothers to complete questionnaires?

80% of mothers accept.

General acceptability of the intervention^a

Is it acceptable for mothers to participate in their infant’s positioning?

80% of mothers find it acceptable.

Is it acceptable for mothers to participate in 30–45 min. intervention sessions, once to twice per week, throughout the hospitalization?

80% of mothers find it acceptable.

Appreciation^a

Were mothers satisfied by the intervention?

80% of mothers were satisfied.

Did mothers find it easy to participate?

80% of mothers found it easy.

Did mothers find it challenging to participate?

Challenges encountered.

Did the mothers find the intervention useful?

80% of mothers found it useful.

Retention^a

Which strategies could enhance retention?

Suggested strategies by mothers.

Recruitment rate

Do eligible mothers consent to participate?

Number of eligible mothers/mothers who consent.

Attrition rate

What is the attrition rate?

Number of randomized mothers/mothers that are lost to follow-up.

Contamination^a

Do intervention mothers share content with other mothers?

Number of intervention mothers who shared content.

Co-intervention

Do mothers and/or infant participate in other research projects?

Number of mothers/infants participating in other research projects.