Fig. 3From: Nature-based social interventions to address loneliness among vulnerable populations: a common study protocol for three related randomized controlled trials in Barcelona, Helsinki, and Prague within the RECETAS European projectPrimary and secondary outcome measures, instruments, and assessment time points for the RECETAS trials for Barcelona, Prague, and Helsinki. Footer: *Primary outcomes are considered at post-intervention (T1), T2 and T3 are assessed as secondary outcomes; T0: Baseline assessment; T1: 3 months from baseline (post intervention); T2: 6 months from baseline (3 months after the end of the intervention); T3: 12 months from baseline (9 months after the end of the intervention)Back to article page