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Table 1 Variables, measures, and methods of analysis

From: Interactive weekly mobile phone text messaging plus motivational interviewing in promotion of breastfeeding among women living with HIV in South Africa: study protocol for a randomized controlled trial

Variable/Outcome

Type

Hypothesis

Outcome measure

Method of analysis

l. Primary

a. Participants recruited

Count

 

Percentage recruited

Descriptive statistics

b. Participants consenting

Count

 

Percentage consenting

Descriptive statistics

c. Completeness of evaluation of outcomes

Count

 

Percentage with complete outcome evaluation

Descriptive statistics

d. Cumulative breastfeeding adherence at six months

Binary

 

Percentage adherence in the last 24 h and 1 week

Descriptive statistics

2. Secondary

a. Adherence to exclusive breastfeeding

Binary

SMS + motivational interview leads to better adherence to breastfeeding than usual care

Percentage adherence in the last 24 h and 1 week

Logistic regression

b. Time to stopping breastfeeding

Time-to-event

SMS + motivational interview prolongs time to stopping breastfeeding than usual care

Reporting of complete cessation of breastfeeding

Kaplan–Meier survival analysis