Table 2. Correlation between ZBI items and overall scores on other assessment tools, São Carlos, SP, Brazil, 2014 (n=341).

Items on ZBI-22	Items on ZBI-12	GDS			PSS			Lawton & Brody IADL
		r	rank		r	rank		r	rank
2.	1.	0.20**	11		0.36**	4		-0.31**	1
3.	2.	0.29**	5		0.39**	1		-0.18**	6
5.	3.	0.30**	4		0.31**	7		-0.04	11
6.	4.	0.23**	9		0.22**	11		-0.06	10
9.	5.	0.31**	3		0.31**	6		0.00	12
10.	6.	0.32**	2		0.38**	2		-0.23**	3
11.	7.	0.24**	8		0.29**	9		-0.11*	8
12.	8.	0.22**	10		0.30**	8		-0.26**	2
17.	9.	0.34**	1		0.36**	3		-0.19**	5
19.	10.	0.26**	7		0.23**	10		-0.11*	7
20.	11.	0.07	12		0.15**	12		-0.09	9
22.	12.	0.27**	6		0.35**	5		-0.20**	4
Total score		0.43**	-		0.53**	-		-0.28**	-

^**p<0.01;

^*p<0.05; ZBI-12: Zarit Burden Interview - 12-item version; PSS: perceived stress scale; GDS: geriatric depression scale; IADL: instrumental activities of daily living