**5. Procedures for data collection and analysis**

The process of insertion of the research team on the islands first involved systematic access to the spaces shared by the family. During the approach of the places frequented by the residents, such as the school, residents' association, and houses themselves, we took care to become part of the population day-by-day by sharing time and activities.

After familiarization with the families, we were able to access their homes with the help of local boaters because of a lack of an address system similar to the ones used in cities given that igarapés are constituted by rivers that intersect, which can cause confusion for those who do not live in the region. After mapping the participants' houses, we began visiting the houses. The observations, talks, and activities were reported in a field diary immediately after the visits.

A statement of consent warranted the rights of the participants, and the ethical committee of the Federal University of Pará approved the study (CAEE – 0016.0.073.000-09).

The inventories were applied with the parents on previously scheduled days. During the interviews, we asked questions, and the participants were free to respond. The responses were recorded and transcribed. The tabulation of responses into categories of activities was based on discussions and agreement of two of the three researchers who collected the data. In case of discordance, we consulted the project mentors.
