Table 2.

Construct validity of the BSFC-s: hypotheses 1 – 5

Hypothesis	Variable	Correlation	P
1	MMSE	rS = −.21	< .001
2	NOSGER Disturbing behavior	rS = .53	< .001
3	Depression diagnosis (yes, no)a	eta = .22	.006
4	Living together (yes, no)b	eta = .19	.001
5	Care level (none, 1, 2, 3)c	eta = .31	< .001
5	Barthel Index	rS = −.45	< .001
5	Caregiving tasks at night (0, 1, >1)d	eta = .39	< .001
5	Informal caregiving time (hours per day)	rS = .54	< .001

MMSE: Mini-Mental Status Examination.

NOSGER: Nurses’ Observation Scale for Geriatric Patients.

r_S: Spearman’s rank correlation coefficient.

Medians of the BSFC-s score for nominally or ordinally scaled variables.

(testing for median differences: Mann–Whitney or Kruskal-Wallis test).

^aDepression diagnosis yes: median: 15.5 (n = 30; 18%).

Depression diagnosis no: median: 8.5 (n = 138; 82%).

^bLiving together yes: median: 10.0 (n = 237; 68%).

Living together no: median: 6.0 (n = 111; 32%).

^cCare level none: median: 6.0 (n = 199; 57%).

Care level 1: median: 11.0 (n = 57; 16%).

Care level 2: median: 15.0 (n = 66; 19%).

Care level 3: median: 12.0 (n = 29; 8%).

^dCaregiving tasks at night no: median: 6.0 (n = 229; 65%).

Caregiving tasks at night once: median: 12.0 (n = 51; 15%).

Caregiving tasks at night several times: median: 16.0 (n = 71; 20%).