Table 1.

Demographic and medical characteristics of study subjects according to depression: Structured Clinical Interview for DSM‐III‐R (SCID) depression and Profile of Mood States (POMS) depression‐dejection

Characteristics	SCID depression		P‐value	POMS depression‐dejection			P‐value
	Absence	Presence		≤2	3–6	≥7
No. subjects	216	13		80	69	77
Demographic characteristics
Age at time of cancer diagnosis (%)			0.94				0.99
≤59 years	35	39		34	36	36
60–69 years	35	31		38	33	35
≥70 years	30	31		29	30	29
Sex (%)			0.92				0.56
Male	60	62		64	62	56
Female	40	39		36	38	44
Marital status (%)			0.62				0.34
Married	82	77		84	87	78
Unmarried	18	23		16	13	22
Education (%)			0.75				0.54
College/university or higher	19	15		23	19	16
High school or less	81	85		78	81	84
Employment, full‐time or part‐time (%)			0.60				0.94
No	54	62		53	55	55
Yes	46	39		48	45	46
Smoking status (%)			0.59				0.33
Never smokers	36	39		33	32	42
Past smokers	24	15		23	33	17
Quit smokers	33	46		39	28	35
Continued smokers	7	0		6	7	7
Presence of confidants (%)			0.39				0.046
Absent	14	23		19	19	7
Present	86	77		81	81	94
Medical characteristics
Method of diagnosis (%)			0.59				0.98
Mass screening or health checkup	61	31		20	22	18
Subjective symptoms	19	62		63	59	60
Follow up for other diseases	18	8		16	16	20
Unknown	2	0		1	3	3
Pathological stage † (%)			0.74				1.00
IA	51	46		51	49	52
IB	26	15		25	29	23
IIA	5	8		5	4	5
IIB	14	23		15	15	14
IIIA	4	8		4	3	5
Histology type (%)			0.53				0.44
Adenocarcinoma	68	85		64	67	74
Squamous cell carcinoma	21	15		28	20	14
Large cell carcinoma	4	0		4	6	3
Other	7	0		5	7	9
Type of surgery (%)			0.45				0.25
Lobectomy	96	100		98	93	97
Pneumonectomy	4	0		3	7	3
Pre‐operative performance status ‡ (%)			0.19				0.71
0	71	54		70	73	66
1	29	46		30	28	34
Performance status ‡ (%)			0.030				0.88
0	38	8		38	36	34
1/2	63	92		63	64	66
Pain (%)			0.007				0.95
None‐mild	73	39		73	71	70
Moderate‐severe	27	62		28	29	30
Dyspnea (%)			0.82				0.61
None‐mild	72	69		74	74	68
Moderate‐severe	28	31		26	26	33
Albumin (%)			0.51				0.64
≥3.5 g/100 mL	97	100		96	99	96
<3.5 g/100 mL	3	0		4	2	4
Pre‐operative percentage VC (%)			0.30				0.29
≥80	93	85		95	93	88
<80	7	15		5	7	12
Pre‐operative FEV 1.0% (%)			0.56				0.47
≥70	78	85		74	81	81
<70	22	15		26	19	20
Co‐morbidity § (%)			0.95				0.88
Absent	61	62		61	62	58
Present	39	39		39	38	42

^† Defined by a tumor nodule metastasis classification: International Union Against Cancer.

^{‡ ‡} Defined by Eastern Cooperative Onology Group.

^§ Combined with hypertension, myocardiac infarction, angina pectoris, diabetes mellitus, renal diseases or liver diseases. FEV 1.0%, percentage forced expiratory volume in 1 s; VC, percentage vital capacity.