Table 4.

Primary and secondary outcome measures.

Outcomes			Measures
Primary outcomes
	Child language	Receptive and expressive language: MacArthur-Bates Communication Development Inventory (short-form version; adapted) Receptive language: Peabody Picture Vocabulary Test (adapted) Expressive language: Expressive One Word Picture Vocabulary Test (adapted)
	Parental sensitivity and parent-child reciprocity	Parental sensitivity and parent-child reciprocity: directly observed book-sharing task rated with the Murray Global Rating Scale
Secondary outcomes
	Child attention	Early Child Vigilance Task
	Child behavior	Prosocial behavior: help task Prosocial behavior: Strengths and Difficulties Questionnaire (prosocial subscale) Behavior: Strengths and Difficulties Questionnaire; total difficulties score
	Parenting	Parental engagement with child: frequency of engagement in joint play with child, self-recorded in diaries Parenting practices: Parenting Styles and Dimensions Questionnaire (connection, physical coercion, and verbal hostility dimensions) Parenting efficacy: Parenting Self-Efficacy questionnaire (TOPSEa; selected questions)
	Parental stress	Parental Stress Scale
Exploratory outcomes
	Child health	Incidence of diarrhea Wasting Stunting Underweight
Moderators and selected confounding variables
	Sex of the child	Child's sex (male or female)
	Socioeconomic situation of families	Asset index
	Parental cognitive abilities	Vienna Matrices Test

^aTOPSE: Tool to Measure Parenting Self-Efficacy.