Table 4. Outcomes and summary of findings from the included studies.

Study author & year	Outcome measures	Time points	Intervention(s) and comparator	Significance of outcomes between-groups	Significance of outcomes within-groups
Henderson et al. (2007)	Anxiety: STAI	Pre- and post-treatment and follow-up (1 month later)	Experimental group (trauma-related mandala design; n = 19) vs control group (object drawing; n = 17)	Anxiety: NS	Exp. group: Anxiety: NS Control group: Anxiety (STAI): NS
Sandmire et al. (2012)	Anxiety: STAI	Pre- and post-art-making (no follow-up)	Experimental group (art-making; n = 29) vs control group (sitting; n = 28)	Anxiety (state): S** Anxiety (trait):S*	Exp. group: Anxiety (state): S** Anxiety (trait) S** Control group (inactive): Anxiety (state): NS Anxiety (trait): NS
Zhan Yu et al. (2016)	Anxiety: HAM-A SAS	Pre- and post-treatment (no follow-up)	Experimental group (HTP followed by group interview; n = 33) vs control group (only group interview; n = 36)	NR	Exp. group: HAM-A:S*** SAS:S** Control group: HAM-A: NS SAS:S* (higher anxiety score)

NR = Not reported.

NS = Not significant.

S = Significant

^* = p<0.05.

^** = p<0.01.

^*** = p<0.001.

STAI: Spielberger's State-Trait Anxiety Inventory (self-report); HAM-A: Hamilton Anxiety Scale; SAS: Zung Self-Rating Anxiety Scale.