Participants’ adherence to voice messages.

Participants’ adherence to voice messages.</p

Structure of the voice message program.

Structure of the voice message program.</p

Mean length of voice messages and time threshold in five local languages by episode number.

Mean length of voice messages and time threshold in five local languages by episode number.</p

Socio-demographic and socio-economic characteristics of study participants (n = 513).

Socio-demographic and socio-economic characteristics of study participants (n = 513).</p

Logistic regression models for picking up a phone call (Model 1) and listening to a voice message up to or beyond time threshold (Model 2).

Logistic regression models for picking up a phone call (Model 1) and listening to a voice message up to or beyond time threshold (Model 2).</p

Flow of the sampling procedure.

Flow of the sampling procedure.</p

Inclusivity in global research.

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Voice messaging intervention characteristics (n = 7182).

Voice messaging intervention characteristics (n = 7182).</p