Variable name;Variable type;Description;;;;;;;;;;;;;;;;;;;;;;;;;;
Authors;Categorical;Authors of the study;;;;;;;;;;;;;;;;;;;;;;;;;;
doi;Categorical;Digital Object Identifier (doi) of the study;;;;;;;;;;;;;;;;;;;;;;;;;;
Year of publication;Numeric;Year of publication of the study;;;;;;;;;;;;;;;;;;;;;;;;;;
Study type;Categorical;Study type. Two possible categories: Descriptive or experimental ;;;;;;;;;;;;;;;;;;;;;;;;;;
Design type;Categorical;Temporal design of the study. Three possible categories: Longitudinal, cross-sectional or pre-post test;;;;;;;;;;;;;;;;;;;;;;;;;;
Data analysis strategy;Categorical;Data analysis strategy used in the study. Three possible categories: Quantitative, qualitative or mixed-methods;;;;;;;;;;;;;;;;;;;;;;;;;;
Type of task;Categorical;Type of task used during the study procedure. Four possible categories: Free-play interactions, experimental interactions, teacher-led interactions and everyday routines;;;;;;;;;;;;;;;;;;;;;;;;;;
Objects;Categorical;Type of objects used during study procedure. Five possible categories (non-exclusive): toys, musical toys, books, artifacts and natural objects. In case no data is available, the category is N/A;;;;;;;;;;;;;;;;;;;;;;;;;;
Infants' age (months);Numeric;Infants' ages in months at the moment of their participation in the study. In case of longitudinal or cross-sectional studies covering a certain age range, the range is specified by a dash (-). In case of articles with two different studies covering different ages, it is specified by (1) and (2);;;;;;;;;;;;;;;;;;;;;;;;;;
Context of interaction;Categorical;Context in which the interaction in the study takes place. Four possible categories: Laboratory, home, nursery school and mixed (two of the previous categories combined);;;;;;;;;;;;;;;;;;;;;;;;;;
Country;Categorical;Country in which the study has collected the data;;;;;;;;;;;;;;;;;;;;;;;;;;