Table 2.

Selected initial coding categories.

Coding category	Explanation	Examples (codes)
Country	Name of country where the study takes place	Australia, Finland
Facilitator	Description of who led or guided the program	preschool teacher, museum staff
Participant ages	Description of the ages of the participants.	six-year-olds, second graders
Program length	Description of how long the program lasted	30 min, 1 h each day for two weeks, unknown
Program setting	Type of locale where the program took place	preschool, park, museum
Publication outlet	Journal in which study was published	Journal of Environmental Education, Early Childhood Education Journal
Publication year	Year in which study was published	2000, 2016
Reported outcomes	Type of student outcomes reported by the authors	environmental knowledge, attitudes
Research type	Type of research conducted based on methods and data	quantitative, qualitative, mixed methods
Overall findings	Overall general level of outcomes reported	positive, mixed, null