《Table 4 The eigenvalues of the correlation matrix in the PCA》

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《"Effect of Short-term Forest Bathing in Urban Parks on Perceived Anxiety of Young-adults: A Pilot Study in Guiyang, Southwest China"》

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All Participants were recruited as volunteers from the major of forest ecology from Guizhou University.At the first-round recruitment stage，only students free from diagnosed cardiovascular，allergic，or mental diseases were selected，while those in poor physical diseases or mental disorders were excluded from this study.On 20December 2016，the day before the first experimental day，first-round-selected participants were assembled to receive full explanation about the research purpose，experimental procedure，and questionnaire details in the following day.They were also informed to prohibit any of vigorous physical activity，smoking，and alcohol consumption before and throughout the whole experiment.Anyone who disagreed or was unwilled to take part in the experiment was excluded at this stage.As a result，43 students were selected as participants.In general，there were 8 male and 35 female participants with the ages ranged from 19 to 23 years-old.The specific demographic characteristics of participants are shown in Table 1.