TABLE 4.

Results on anxiety studies.

References	Results on anxiety
	Decrease of symptoms
Van der Wal and Kok (21)	- In 14 of 15 studies. - Average effect size for humorous therapies was 49% lower than for non-humorous therapies.
Zhao et al. (22)	- In 2 of 7 studies. - Laughter and humor interventions (p = 0.01). - Laughter interventions alone (p = 0.02) (5 studies). - Humor interventions alone (p = 0.28) (2 studies).
Ventis et al. (28)	- Significant for humorous and non-humorous interventions compared to control group: - Finished more items on BAT (p = 0.006). No significant difference between both type of interventions. - Scored higher on SCD (p = 0.001). No significant difference between both type of interventions. - On fear ratings, only non-humorous interventions had significant results (p = 0.49).
Cai et al. (17)	- Measured on State Trait Anxiety Inventory (Chinese version) (p < 0.005).
Gelkopf et al. (26)	- Measured on BPRS total score (p < 0.001). - Measured on sub-score BPRS: Anxiety-depression (p < 0.001)

BAT, Behavioral Approach Test; SCD, Spider Cognitive-Dimensions; BPRS, Brief Psychiatric Rating Scale.