Unique identity for an individual respondent (only known if the respondent provided their email address and that email address did not change over time).

Unique identifier for each survey response.

Campaign year

Campaign year re-scaled and recentered around zero.

A four-level factor indicating the respondent's previous NZGBS experience.

Gender of adult respondents (male, female or other, where no response, preferred to say or mixed group).

Six-level factor: under 20 years old, 20-39 years old, 40-59 years old, older than 59 years old or a mixed age group or unknown.

Five-level factor for ethnicity of participants: European, Māori, Asian, Other or Unknown

A member of a non-governmental conservation, environmental, or similar organisation or society (e.g. Forest and Bird)

A member of a garden or horticultural club or society

Employed in the field of conservation, environment, or resource management

Employed in the biological sciences

An amateur bird watcher, naturalist, or ‘citizen scientist’

A student in a school or tertiary institution (university, polytech, etc)

A teacher in a school

None of the roles or interested listed applied to the respondent

Aware of the latest NZ Garden Bird Survey results resources: Yes, No or blank (no response)

Interested or not in latest NZ Garden Bird Survey results resources (if aware of them)