Construction and validation of a nomogram to predict the overall survival of small cell lung cancer: a multicenter retrospective study in Shandong province, China

Table 1 Demographic and clinical characteristics of patients with small cell lung cancer in the training set and validation set

Characteristics	Training set, No. (%) (n = 1465)	Validation set, No. (%) (n = 844)	χ²	P value
Sex
Male	1071 (73.11)	598 (70.85)
Female	394 (26.89)	246 (29.15)	1.356	0.244
Age
≤ 45	110 (7.51)	41 (4.86)
46–60	601 (41.02)	328 (38.86)
61–75	647 (44.16)	411 (48.70)	8.833	0.032
> 75	107 (7.30)	64 (7.58)
Region
Eastern	302 (20.61)	126 (14.93)
Southern	122 (8.33)	110 (13.03)
Western	402 (27.44)	331 (39.22)	60.276	< 0.001
Northern	639 (43.62)	277 (32.82)
Hospital
Specialized	227 (15.49)	124 (14.69)
General	1238 (84.51)	720 (85.31)	0.268	0.605
Health insurance
Urban employees’ basic medical insurance	388 (26.48)	138 (16.35)
Urban residents’ basic medical insurance	168 (11.47)	141 (16.71)
New rural cooperative medical scheme	833 (56.86)	506 (59.95)	61.652	< 0.001
Self-pay	56 (3.82)	20 (2.37)
Other	20 (1.37)	39 (4.62)
Smoke
No	582 (39.73)	348 (41.23)
Yes	883 (60.27)	496 (58.77)	0.504	0.478
Alcohol use
No	977 (66.69)	555 (65.76)
Yes	488 (33.31)	289 (34.24)	0.208	0.648
TNM Stage
I	75 (5.12)	47 (5.57)
II	141 (9.62)	77 (9.12)
III	592 (40.41)	331 (39.22)	0.720	0.868
IV	657 (44.85)	389 (46.09)
Surgery
No	1373 (93.72)	800 (94.79)
Yes	92 (6.28)	44 (5.21)	1.099	0.294
Chemotherapy
No	305 (20.82)	216 (25.59)
Yes	1160 (79.18)	628 (74.41)	6.983	0.008
Radiotherapy
No	1095 (74.74)	670 (79.38)
Yes	370 (25.26)	174 (20.62)	6.401	0.011

Notes: Eastern, Southern, Western, and Northern represent respectively Eastern of Shandong, Southern of Shandong, Western of Shandong, and Northern of Shandong; Specialized, General represent respectively specialized tumor hospitals and general hospitals

ISSN: 1471-2407