TABLE 1.

The nine items selected based on the construct of interest.

Abbreviation	Item	Explanation for content validity	Origin of the item
EMO_1	I find it exciting to deal with nature	“Exciting” as a positive feeling	(Frey et al., 2009) I find the content really exciting
EMO_2	Learning about nature is fun for me	“Fun” as a positive feeling	(Mang et al., 2018) Learning mathematics is simply fun for me
EMO_3	When I am engaged in nature, I am very concentrated and forget everything around me	If someone is so intensively involved with a subject, the person must also associate positive feelings with it	(Mang et al., 2019) I quickly forget the time when I use digital devices
COG_1	I would like to know much more about nature	Desire to obtain more knowledge	(Wenzel, 2016) I would like to know more about some topics
COG_2	I would like to learn more about nature	Desire to obtain more knowledge	(Pawek, 2009) I would like to learn more about the experiments […]
COG_3	In my free time I often deal with topics related to nature	Wanting to spend free time on a subject implies that there is a desire to know more	(Holstermann, 2009) In my free time, I also deal with the structure of the heart
VALUE_1	I find it meaningful to be involved with nature	“Meaningful” assigns a personal value to nature	(Wenzel, 2016) I find it meaningful to be involved with animals
VALUE_2	I think it’s important to be well informed about nature	“Important” assigns a personal value to nature	(Wenzel, 2016) I think it’s important to be well informed about animals
VALUE_3	The subject of nature is important to me	“Important to me” assign a value to nature	(Holstermann, 2009) To understand the function of the heart is important to me

The last column shows the origin and the English translation of each item. The items were adapted by the authors to the topic “interest in nature” and partly modified.