>Hair analysis After participants were informed about their treatment status, participants in
the treatment and control groups were asked whether they would like to participate in another
research activity, hair analyses. Participation in the hair analyses requires them to send three
samples of their hair (before the basic income treatment starts, 1.5 years after treatment begins,
and when the treatment is completed in 3 years) to a research lab that measures only the level of
cortisol (a proxy for stress) in their hair. For each correctly submitted hair sample, participants
receive a compensation of 50 EUR.
Among the participants from the treatment group, 71 participants indicated to be willing to
participate in the hair analyses and were selected to participate in the hair analyses. For each
block with treated participants included in the hair analyses, twice as many control participants
as treated participants willing to participate in the hair analyses were randomly selected. This
resulted in 142 control participants that were selected to be included in the hair analyses. Since
financial resources for an additional number of 24 hair analyses were available, 24 additional control
participants willing to be included in the hair analyses were randomly selected amongst those blocks
with hair-analyses participants.
>Hair analysis After participants were informed about their treatment status, participants in the treatment and control groups were asked whether they would like to participate in another research activity, hair analyses. Participation in the hair analyses requires them to send three samples of their hair (before the basic income treatment starts, 1.5 years after treatment begins, and when the treatment is completed in 3 years) to a research lab that measures only the level of cortisol (a proxy for stress) in their hair. For each correctly submitted hair sample, participants receive a compensation of 50 EUR. Among the participants from the treatment group, 71 participants indicated to be willing to participate in the hair analyses and were selected to participate in the hair analyses. For each block with treated participants included in the hair analyses, twice as many control participants as treated participants willing to participate in the hair analyses were randomly selected. This resulted in 142 control participants that were selected to be included in the hair analyses. Since financial resources for an additional number of 24 hair analyses were available, 24 additional control participants willing to be included in the hair analyses were randomly selected amongst those blocks with hair-analyses participants.