Table 1 SPIRIT schedule of enrolment, intervention, and assessments of the Nextdoor KIND Challenge

 Informed consent

X

 Allocation

X

 Demographic form

X

 UCLA-LS3

X

X

X

X

 LSNS-18

X

X

X

X

 EUROHIS-QOL-8

X

X

X

X

 PHQ-8

X

X

X

X

 Mini-SPIN

X

X

X

X

 PSS-4

X

X

X

X

 PANAS

X

X

X

X

 CE

X

 SCS

X

X

X

X

 Number of Contacts

X

X

X

X

 Neighbourhood Perception of Change

X

X

X

X

 Neighbourhood Importance

X

X

X

X

 Neighbourhood Modified Social Relationship Index

X

X

X

X

 Neighbourhood Conflict

X

X

X

X

 Neighbourhood interaction since COVID-19

X

X

X

X

 Pre-KIND Challenge Neighbourhood Contact and Previous Kindness activity

X

X

 Nextdoor Platform Activity

X

X

X

X

 COVID-19 Social Restrictions

X

X

X

X

 Challenge Activity Nomination

X^b

X

 Post-KIND Challenge Activity

X

 Safety

X

 Post-Kind Challenge Overall Impact

X

 Follow-Up KIND Challenge Activity

X