Table 2.

Mean Scores by Time for Treatment and Control Groups with Standardized Mean Difference Statistics for Week 7

	Week 0	Week 3	Week 6	Week 7	Week 10	Effect Size at Week 7	Effect Size of Change Score (Week 7–Week 0)
CSDD
Control	5.36 ± 4.20			3.63 ± 3.64	3.00 ± 2.47
Treatment	4.00 ± 2.99			4.30 ± 4.56	4.73 ± 3.27	0.17	0.45
QOL Resident-rated
Control	43.29 ± 6.85			45.16 ± 5.35	44.20 ± 5.91
Treatment	42.41 ± 7.62			44.98 ± 6.37	44.12 ± 5.98	0.031	0.14
QOL Staff-rated
Control	41.79 ± 7.91			41.89 ± 7.28	43.48 ± 7.18
Treatment	40.39 ± 6.35			39.85 ± 8.07	39.15 ± 8.50	0.27	0.009
NPI-NH
Control	12.54 ± 12.63			8.00 ± 8.91	5.12 ± 6.25
Treatment	5.89 ± 7.05			6.30 ± 8.14	10.27 ± 12.20	0.18	0.49
Social Communication
Control	5.60 ± 1.06			5.35 ± 1.24	5.52 ± 1.22
Treatment	5.93 ± 0.90			5.87 ± 1.04	5.62 ± 1.14	0.49	0.29
Basic Needs Communication
Control	5.91 ± 0.77			5.66 ± 1.23	5.76 ± 1.16
Treatment	6.16 ± 0.79			6.14 ± 0.92	5.96 ± 1.27	0.43	0.29
OERS pleasure
Control	2.11 ± 1.05	2.04 ± 0.90	2.52 ± 1.22	1.73 ± 0.78	1.84 ± 0.90
Treatment	1.96 ± 0.96	3.42 ± 0.93	3.48 ± 1.05	2.31 ± 1.12	2.27 ± 0.96	0.58	0.61

Notes. CSDD = Cornell Scale for Depression in Dementia; QOL = Quality of Life-Alzheimer’s Disease; NPI-NH = Neuropsychiatric Inventory-Nursing Home Version; OERS = Observed Emotion Rating Scale