Table 2.

Prevalence of major depression based on risk factors in breast cancer patients (N=300)

Variables	Group	Major depression/total number	Prevalence (%)	95% CI (%)	p-value
Total patients		25/300	8.33	5.21–11.46
Basic characteristics
Age	18–40 years	8/63	12.7	4.48–20.9	0.343
	41–54 years	13/171	7.60	3.63–11.6
	≥55 years	4/66	6.06	0.31–11.8
Marriage	No	6/74	8.11	1.89–14.3	0.928
	Yes	19/225	8.44	4.81–12.1
Cigarette smoking	No	22/270	8.15	4.88–11.4	0.793
	Yes	3/29	10.3	0.0–21.4
Alcohol drinking	No	18/197	9.14	5.11–13.2	0.515
	Yes	7/101	6.93	1.98–11.9
Regular exercise	Yes	11/172	6.40	2.74–10.1	0.153
	No	14/127	11.0	5.58–16.5
Psychosocial factors
Insomnia	Yes	16/119	13.5	7.32–19.6	0.010
	No	9/180	5.00	1.81–8.18
Taking sleeping pills	Yes	8/47	17.0	6.28–27.8	0.019
	No	17/252	6.75	3.65–9.84
Psychiatric family history	Yes	6/27	22.2	6.54–37.9	0.006
	No	19/254	7.48	4.25–10.7
Chronic pain within one year	Yes	14/84	16.7	8.70–24.6	0.001
	No	11/215	5.12	2.17–8.06
Cancer related factors
Menopause	Yes	10/180	5.60	2.21–8.90	0.031
	No	15/119	12.6	6.64–18.6
Duration of breast cancer	≤1 year	18/150	12.0	6.80–17.2	0.012
	>1 year	6/148	4.05	0.88–7.23
Stage of cancer	I–III	20/249	3.4	1.15–5.65	0.540
	IV	1/9	4.8	−9.17–18.8
Treatments
Operation	Yes	21/247	8.50	5.02–12.0	0.819
	No	4/53	7.55	0.44–14.7
Radiation therapy	Yes	20/176	11.36	6.67–16.1	0.024
	No	5/124	4.03	0.57–7.49
Hormone therapy	Yes	13/210	6.19	2.93–9.45	0.040
	No	12/90	13.33	6.31–20.4
Chemotherapy	Yes	20/215	9.30	5.42–13.2	0.334
	No	5/85	5.88	0.88–10.9
Target-drug therapy	Yes	8/68	11.7	4.11–19.4	0.244
	No	17/232	7.33	3.97–10.7