Table 1.

Basic DEmographic and Clinical Characteristics of the Study Sample

	The whole sample		Poor sleepers (n = 182)		Good sleepers (n = 323)		Statisticsb
	N	%	N	%	N	%	X2	df	P
Men	243	48.1	85	46.7	166	51.4	1.0	1	0.3
Married/cohabitating	228	45.1	90	49.5	138	42.7	2.1	1	0.1
Being employed	165	32.7	50	27.5	115	35.6	3.4	1	0.06
On typical AP(s) only	244	48.3	97	53.3	147	45.5	2.8	1	0.09
On atypical AP(s) only	219	43.4	66	36.3	153	47.4	5.8	1	0.01
On BZD	151	29.9	78	42.9	73	22.6	22.7	1	< 0.001
On hypnotics	125	24.8	82	45.1	43	13.3	62.9	1	< 0.001
	Mean	SD	Mean	SD	Mean	SD	T / Z	df	P
Age (year)	43.0	8.4	44.1	8.4	42.3	8.4	2.3	503	0.02
Monthly income (HK$)	2022	2511	1919	2335	2080	2608	−0.4a		0.6
Age at onset (year)	26.8	7.6	27.8	7.4	26.3	7.7	2.1	503	0.03
Number of admission	2.3	2.2	2.1	2.1	2.4	2.2	−2.1a		0.03
CPZeq (mg)	273	188	275	189	271	187	−0.1a		0.8
BPRS positive score	1.4	0.7	1.6	0.8	1.3	0.5	5.4	503	< 0.001
BPRS negative score	1.4	0.5	1.4	0.5	1.3	0.5	1.4	503	0.2
BPRS anxiety score	1.4	0.6	1.6	0.6	1.3	0.5	5.8	503	< 0.001
EPS sum score	0.6	1.6	1.1	2.1	0.4	2.1	−3.3a		0.001
HAMD score	4.4	4.0	7.3	4.4	2.7	2.4	−13.0a		< 0.001
Physical QOL	14.2	2.4	12.8	2.4	14.9	2.1	−10.1	503	< 0.001
Psychological QOL	13.6	2.6	12.4	2.6	14.2	2.4	−7.7	503	< 0.001
Social QOL	13.1	2.6	12.2	2.6	13.6	2.5	−5.9	503	< 0.001
Environmental QOL	13.6	2.2	13.0	2.1	14.0	2.2	−4.9	503	< 0.001

a=Mann-Whitney U test; b=poor sleepers vs good sleepers; AP=antipsychotic drug; BZD=benzodiazepine; EPS=extrapyramidal side effects; QOL=quality of life; HAMD=Hamilton Depression Rating Scale; BPRS=Brief Psychiatric Rating Scale