6. Decoration: Characteristics of included studies.

Study ID	Methods	Participants	Interventions	Outcomes	Notes
Edge 2003	RCT; 4 parallel groups.	DESCRIPTION: 39 in‐patients (10 post‐operative for cardiac surgery, 29 undergoing cardiac observations) in a cardiac care unit in Florida, USA. NUMBERS: Beige = 13, Purple = 10, Green = 9, Orange = 7. AGE: 26 to 89 years old. GENDER (male/female): 20/19. ETHNICITY: not described. INCLUSION CRITERIA: Admitted to unit between February and March 2003. EXCLUSION CRITERIA: Colour blind; non‐English speaking; not able to understand or confused.	BEIGE: Walls remained original colour of beige (similar to Sherwin Williams colour SW6658) in four rooms. PURPLE: Wall at foot of bed painted purple (SW6556) in two rooms. GREEN: Wall at foot of bed painted green (SW6451) in two rooms. ORANGE: Wall at foot of bed painted orange (SW6346) in two rooms. Otherwise rooms were of same decor and intervention colours were co‐ordinated with colours already present in the rooms (e.g. on bed curtains). Artwork was removed from the rooms. Rooms were double occupancy with western outlook. Curtains were combination of orange, yellow, green, blue, and purple. Laminate countertops were green, and floors were orange and green. Furniture was neutral shades of white, grey, or beech wood.	ANXIETY: Measured via STAI on day of discharge (after 2 to 5 days in hospital). Presented as mean (SD). No significant differences reported. LENGTH OF STAY: Extracted from patient notes by researcher (days). No SDs presented. No significant differences reported. PAIN MEDICATION REQUESTS: Extracted from patient notes by researcher. Presented as number of patients making requests and number of requests made (no SDs presented), subgrouped by first day, middle days, and final day. No significant differences reported.	Partients in this study were not approached for informed consent until Day 3 of the study.

STAI: State Trait Anxiety Inventory