Table 12.

Original data of the studies examining the influence of indoor plants on EEG β waves.

Study	Study Design	Appraisal Quality	Without Plant			With Plant
			n	Mean	SD	n	Mean	SD
[72]	Experiment (non-RCT)	Moderate	38	0.160	0.240	38	0.120	0.220
[81]	Experiment (RCT)	Moderate	17	0.051	0.046	17	0.214	0.057