Extension and Validation of the Self-care Index to Predict Transfer to a Post-acute Care Institution in Internal Medicine Patients / Erweiterung und Validierung des Selbstpflegeindexes bei internistischen Patienten mit dem Ziel eine Verlegung in eine post-akute Nachsorgeinstitution vorauszusagen

	Overall	Discharged to PAC facility	Discharged to home	P-value
	n = 1372	n = 154	n = 1218
Gender^a: female (%)male (%)	571 (41.6%)801 (58.4%)	93 (60.4%)61 (39.6%)	478 (39.2%)740 (60.8%)	<0.001
Age^b: mean (SD); median [IQR]	66.4 (15.9)69 [57–78]	75.3 (12.3)77.5 [69–83]	65.3 (16.0)68 [56–77]	<0.001
SPI first assessment on ward^b: mean (SD); median [IQR]	35.6 (6.0);38 [34–40]	29.0 (7.5);30 [25–35]	36.4 (5.2);38 [35–40]	<0.001
Length of hospital stay^b: mean (SD); median [IQR]	7.7 (7.8);6 [4–9]	16.8 (12.2);14 [10–21]	6.6 (6.2);5 [3–8]	<0.001

Extended model: SPI all individual items, age, and gender AUC = 0.842	Medical in-patients training dataset (n = 814)
	Coefficients	Sig.
Activity	−0.011	0.957
Body care, upper body	0.046	0.895
Body care, lower body	−0.304	0.429
Dress/undress upper body	−0.099	0.781
Dress/undress lower body	−0.661	0.105
Food intake	−0.496	0.093
Drink intake	0.972	0.005
Urine excretion	−0.229	0.248
Stool excretion	0.044	0.849
Acquire knowledge	−0.537	0.005
Age (centered around 65 years)	0.024	0.013
Gender	0.666	0.010
Constant	−0.577	0.606

10 SPI all individual items	Medical inpatients Conca, this study		Mixed population Grosse Schlarmann, 2007
	Odds ratio	Sig.	Odds ratio	Sig.
Activity^*	0.73	0.03	0.40	<0.001
Food intake	0.70	0.17	0.51	0.38
Drink	2.67	0.001	4.32	0.07
Urine^*	0.92	0.53	0.39	0.001
Stool	1.07	0.66	1.38	0.45
Body care, upper body	1.02	0.93	0.78	0.64
Body care, lower body	0.44	0.002	0.23	0.005
Dress/undress upper body	0.88	0.61	0.68	0.48
Dress/undress lower body	0.96	0.89	2.92	0.06
Acquire knowledge	0.57	<0.001	0.95	0.86

Model training (t), validation (v)^an = 814 (t), n = 558 (v)	AUC	AIC	BIC
Total SPI, t	0.824	477.0	486.4
Total SPI, v	0.808	338.9	347.6
Total SPI + age + gender, t	0.836	456.5	475.3
Total SPI + age + gender, v	0.829	321.1	329.8
SPI all individual items, t	0.828	461.6	513.3
SPI all individual items, v	0.814	328.2	336.8
SPI all individual items + age + gender, t	0.848	451.2	512.3
SPI all individual items + age + gender, v	0.837	317.9	326.5

	Dimension	Additional information
Point value: 1–4 (no ability / severely impaired ability / low impaired ability / full ability)	Movement	Self-care ability activity/movement (e.g., from bed to chair)
	Personal hygiene, upper body	Self-care ability in personal hygiene, upper body
	Personal hygiene, lower body	Self-care ability in personal hygiene, lower body
	Dressing, upper body	Self-care ability in dressing and undressing upper body
	Dressing, lower body	Self-care ability in dressing and undressing lower body
	Feeding, food	Self-care ability ingestion: food
	Feeding, drink	Self-care ability ingestion: drink
	Excretion, urine	Self-care ability urine excretion
	Excretion, stool	Self-care ability stool excretion
	Cognition/consciousness	Ability to acquire knowledge
Scoring (sum of points):	10 (full dependency)	40 (full independency)