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Correlational findings

Study Hermans et al. (2019): study NL 2016

Public:
Office workers followed 3 years before and after placing plants in their workplace and controls, Netherlands 2016-2018
Survey name:
Unnamed study
Sample:
Respondents:
N = 119
Non Response:
Assessment:
Questionnaire: web
Workers received a questionnaire by e-mail at T1, T3, T4 and T5

Correlate

Authors's label
Plants in office
Our Classification
Operationalization
1; Plants placed in office (experimental)
0: No plants placed (control)

Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks A-AB-cw-mq-v-4-k DM = + p < .05 Positive affect declined in control group and rose slightly in experimental group, resulting in a significant T1-T3 change.
Change in negative affect insignificant.
Net effect on affect balance not reported but is likely to be positive
No significant differences in change between experimental and controls between T1 and T4 T5
O-SLW-c-sq-n-10-a DM = ns No significant differences in change between experimental and controls between T1 and T3, T4 T5

Happiness assessed at
T1: Spring 2017: pretest
T2: 2 months:    intervention
T3: 4 months:    follow-up 1
T4: 6 months:    follow-up 2
T5: 12 months:   follow-up 3