Do some anxiety disorders belong to the prodrome of bipolar disorder? A clinical study combining retrospective and prospective methods to analyse the relationship between anxiety disorder and bipolar disorder from the perspective of biorhythms

Table 1 Demographic characteristics

Characteristic		BD (n = 48)			Atypical (n = 63)			Anxiety (n = 111)			χ ²	F
Characteristic		Mean ± SD	n	Percentage (%)	Mean ± SD	n	Percentage (%)	Mean ± SD	n	Percentage (%)	χ ²	F
Age (years)		33.06 ± 14.53			34.33 ± 15.55			37.38 ± 12.15				0.676
Sex	Male		15	31.3		18	28.6		39	35.1	0.276
Sex	Female		33	68.8		45	71.4		72	64.9
Nationality	Han		45	93.8		60	95.2		105	94.6	0.039
Nationality	Minority		3	6.3		3	4.8		6	5.4
Birth place	SC		42	87.5		51	80.9		105	94.6	5.728
	CQ		3	6.3		0	0		0	0
	GZ		0	0		3	4.8		0	0
	Others		3	6.3		9	14.3		6	5.4
Residence	City		36	75		54	85.7		90	81.1	0.680
Residence	Village		12	25		9	14.3		21	18.9
Education	Primary		0	0		0	0		9	8.1	5.267
	Middle		12	25		15	23.8		24	21.6
	High		24	50		27	42.9		33	29.7
	Bachelor		12	25		21	33.3		45	40.5
	Master		0	0		0	0		0	0
Marriage	Unmarried		27	56.3		30	47.6		24	21.6	14.493**
	Married		12	25		27	42.9		81	73
	Divorced		6	12.5		6	9.5		6	5.4
	Remarried		0	0		0	0		0	0
	Widowed		0	6.3		0	0		0	0
Work	None		24	50		24	38.1		30	27	3.926
	Student		12	25		18	28.6		15	13.5
	Worker		6	12.5		0	0		12	10.8
	Teacher		3	6.3		3	4.8		9	8.1
	Doctor		0	0		0	0		3	2.7
	Civil servant		0	0		6	9.5		12	10.8
	Staff		0	0		12	19		18	16.2
	Others		3	6.3		0	0		12	10.8

**P < 0.01
Han represents the Han nationality, SC represents Sichuan province, CQ represents Chongqing city, and GZ represents Guizhou province

ISSN: 1471-244X