. Author manuscript; available in PMC: 2007 Oct 4.

Published in final edited form as: Int J Geriatr Psychiatry. 2007 Jun;22(6):543–548. doi: 10.1002/gps.1712

Table 3.

Hospital utilization by depression diagnosis

Type of Care^*	PD patients with depression (n = 7599)	PD patients without depression (n = 33,563)	Test statistics
Inpatient admissions
No. of patients, n (%)	2,165 (28.5%)	5,634 (16.8%)	X² = 552.71, p<0.0001
No. of admissions, mean (SD)	2.0 (1.5)	1.8 (1.3)	t = -6.35, p<0.0001
Psychiatric admissions
No. of patients, n (%)	318 (4.2%)	551 (1.6%)	X² = 193.90, p<0.0001
No. of admissions, mean (SD)	1.5 (1.1)	1.5 (1.0)	t = 0.42, p = 0.6715
Medical admissions
No. of patients, n (%)	1,588 (20.9%)	4,293 (12.8%)	X² = 332.51, p<0.0001
No. of stays, mean (SD)	1.7 (1.2)	1.6 (1.0)	t = -4.68, p<0.0001
Other institutional care^**
No. of patients, n (%)	915 (12.0%)	2,156 (6.4%)	X² = 283.18, p<0.0001
No of admissions, mean (SD)	1.3 (0.7)	1.2 (0.6)	t = -3.22, p = 0.0013
Outpatient care
No. of patients, n (%)	7,483 (98.5%)	33024 (98.4%)	X² = 0.25,p = 0.6174
No. of visits, mean (SD)	27.0 (35.5)	15.9 (22.7)	t = -25.62, p<0.0001^***
Psychiatric visits
No. of patients, n (%)	3819 (50.2%)	3,878 (11.6%)	X² = 6104.82, p<0.0001
No. of visits, mean (SD)	7.6 (22.5)	9.5 (29.9)	t = 3.17, p<0.01^***
Medical visits
No. of patients, n (%)	7,468 (98.3%)	32,995 (98.3%)	X² = 0.037, p = 0.8475
No. of visits, mean (SD)	23.1 (28.4)	14.8 (18.7)	t = -24.16, p<0.0001^***

Care received over 12-month period in fiscal year of 2002.

^**

Other institutional inpatient care includes residential rehabilitation, domiciliary and vocational care, and nursing home care.

^***

All p-values <0.01 after adjusting for age, race, marital status, and comorbid conditions in linear regression models (log-transformed) for association between depression and number of outpatient visits.