Table 1.

Characteristics of all variables used in this study

Type	Variable name	Form	Source	Time	Use of standardised tool
Explanatory	Preoperative falls	0, 1, 2, 3+	Survey	BL	Yes21
	Charlson Comorbidity Index	Ordinal, 0–12	CPAP H&P	BL	Yes29
	ASA physical status	Ordinal, 1–6	Anaesthesia record	Surgery	Yes30
	Procedural cardiac risk	Ordinal, 5 categories from high to low	CPAP clinician	BL	Yes31
Outcome	Postoperative falls	Binary (V.2); 0, 1, 2, 3+ (V.3)	Survey	30 days, 1 year	Yes21
	Functional dependence	Ordinal, 0–100 by 5	Survey	30 days, 1 year	Yes32
	Physical quality of life	Continuous, 0–100	Survey	30 days, 1 year	Yes33 34
	Mental quality of life	Continuous, 0–100	Survey	30 days, 1 year	Yes33 34
	In-hospital complications	Dichotomous	Survey	30 days	No
	Readmission	Dichotomous	Survey	30 days	No
Demographic	Age	Continuous	Medical record	BL	NA
	Sex	Dichotomous	Medical record	BL	NA
	Race	Nominal	Medical record (patient report)	BL	NA
	Ethnicity	Hispanic/Latino or not	Medical record (patient report)	BL	NA
	Body mass index	Continuous	CPAP nurse	BL	Yes
Confounder	Functional dependence	Ordinal, 0–100 by 5	CPAP nurse	BL	Yes32
	Physical quality of life	Continuous, 0–100	Survey	BL	Yes33 34
	Mental quality of life	Continuous, 0–100	Survey	BL	Yes33 34
	Smoking status	Current, past, never	CPAP physician or nurse	BL	NA
	Physical activity level	<4, 4–6, 6–10, >10 (METs)	CPAP physician	BL	Yes35
	Incontinence	Dichotomous (any issue)	CPAP nurse	BL	Yes32
	Toileting difficulty	Dichotomous (any issue)	CPAP nurse	BL	Yes32
	Mobility issue	Dichotomous (any issue)	CPAP nurse	BL	Yes32
	Neurological impairment (stroke, paraplegia or quadriplegia, Parkinson disease or multiple sclerosis)	Dichotomous	CPAP H&P	BL	No
	Chronic pain	Dichotomous	CPAP physician ROS	BL	No
	Dizziness/vertigo	Dichotomous	CPAP physician ROS	BL	No
	Depression	Dichotomous	CPAP H&P	BL	No
	Anxiety	Dichotomous	CPAP H&P	BL	No
Descriptive	Fall-related injury	Check all that apply	Survey	BL, 30 days, 1 year	No
	Days from BL to 30 days survey	Continuous	BL survey, Press Ganey	BL completion date to 30 days process date	NA
	Days from BL to 1 year survey	Continuous	BL survey, Press Ganey	BL completion date to 1 year process date	NA
	Surgery type	10 categories	Medical record	BL	NA
	In-hospital falls	Dichotomous	Survey (V.3 only)	30 days	Yes21
	In-hospital heart problem or stroke	Dichotomous	Survey	30 days	No
	In-hospital lung complication	Dichotomous	Survey	30 days	No
	In-hospital blood clot	Dichotomous	Survey	30 days	No
	In-hospital kidney or intestine complication	Dichotomous	Survey	30 days	No
	In-hospital nerve injury	Dichotomous	Survey	30 days	No
	In-hospital infection	Dichotomous	Survey	30 days	No
	In-hospital delirium	Dichotomous	Survey	30 days	No
	Other in-hospital complication	Dichotomous	Survey	30 days	No

ASA, American Society of Anesthesiology; BL, baseline; CPAP, centre for preoperative assessment and planning; H&P, history and physical; METs, metabolic equivalents; NA, not applicable; ROS, review of systems.