Table 3.

Clinical Characteristics of Elderly and Adult Patients

Characteristics	N (%) or Mean ± SD		P value
	Age < 60 Years (N = 76)	Age ≥ 60 Years (N =19)
Female (%)	50 (65.8%)	10 (52.6%)	0.301
Body mass index	25.5 ± 5.9	23.4 ± 5.5	0.153
Diagnosis
Schizophrenia	30 (39.5%)	2 (10.5%)
Schizoaffective disorder	9 (11.8%)	1 (5.3%)
Bipolar Disorder
Depression	7 (9.2%)	3 (15.8%)	0.008*
Mania	13 (17.7%)	1 (5.3%)
Major depressive disorder	14 (18.4%)	11 (57.9%)
Other diagnosis	3 (3.9%)	1 (5.3%)
Duration of illness	12.1 ± 8.6(23)	11.2 ± 10.7(6)	0.383
History of previous ECT	22 (28.9%)	3 (15.8%)	0.741
Concurrent Medication
Benzodiazepine	4 (5.3%)	0	0.58
Antipsychotic	68(89.5%)	14 (73.7%)	0.127
Antidepressant	14 (18.4%)	8 (42.1%)	0.029
Anticonvulsant	5 (6.6%)	1 (5.3%)	1
Anticholinergic	11 (14.5%)	1 (5.3%)	0.449
Electrode Placement
Right unilateral	21 (27.6%)	11 (57.9%)	0.013*
Bilateral	55 (72.4%)	8 (42.1%)
Dose of Anesthetic Agents (mg)
Thiopental (n = 66 versus n = 16)	195.1 ± 68	159.4 ± 73.5	0.067
Propofol (n = 10 versus n = 3)	105 ± 43.8	63.7 ± 5.5	0.149
Seizure threshold (mC)	113.9 ± 98.7	129.9 ± 121.1	0.549

Note: *p < 0.05

Abbreviations: SD, standard deviation; mg, milligrams; mC, millicoulombs.