Development of a social activities scale for community-dwelling older people requiring support.

Seventy-five HOP and 157 OPRS provided effective responses. The scale (α = 0.805) had three subscales: "interactions with friends and neighbors (F1)," "close relationships with family (F2)" and "interactions with others through activity programs (F3)." SASOS and SAI-E scores were correlated (r = .558, p < .01), indicating criterion-related validity. In known-groups validity analysis, F1 were significantly higher among HOP and F3 were significantly higher among OPRS. Total scores correlated with perceived health (r = .240, p < .01) and ikigai (r = .419, p < .01).