Table 2.

Summary statistics of CES-D score and time-varying variables

		Three-month (n = 214)a	Cronbach’s alpha for three-month	One-year (n = 143)b	Cronbach’s alpha for 1-year
Caregivers
Median CES-D (IQR)		4 (2–7)	0.84	3 (1–5)	0.76
Median ZBI Score (IQR)		7 (5–13)	0.82	5 (0–11)	0.88
Median quality of care-relationship (IQR)		12 (10–12)	0.89	12 (9–12)	0.95
Median expressive social support (IQR)		25 (23.5–32)	0.95	24 (23–29)	0.93
Median OCBS (IQR)		31 (23–42)	0.92	29 (19–37)	0.95
Number of health conditions, n (%)
	No health conditions	151 (72.3%)		125 (87.4%)
	1 or more health condition	58 (27.8%)		18 (12.6%)
Patients
Median CES-D (IQR)		4.5 (1–9)	0.88	4 (1–7)	0.80

CES-D (Center for epidemiologic studies depression), n (sample size), IQR (Interquartile range), OCBS (Oberst caregiving burden score), ZBI (Zarit Burden Interview)

^aNumber of missing observations: Caregivers’ CES-D (n = 5), ZBI (n = 3), Expressive Social Support (n = 2), OCBS (n = 35), number of health conditions (n = 5), Patients’ CES-D (n = 14)

^bNumber of missing observations: Caregivers’ CES-D (n = 2), ZBI (n = 3), Expressive Social Support (n = 2), OCBS (n = 6), Patients’ CES-D (n = 2)