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Table 1 Baseline characteristics of training group and validation group

From: Risk analysis of pulmonary metastasis of chondrosarcoma by establishing and validating a new clinical prediction model: a clinical study based on SEER database

  Level Overall
(n = 944)
Training group
(n = 664)
Validation group
(n = 280)
p
Age (mean (SD)) NA 55.09 (18.08) 54.60 (18.24) 56.23 (17.67) 0.206
Sex (%) female 405 (42.9) 291 (43.8) 114 (40.7) 0.418
male 539 (57.1) 373 (56.2) 166 (59.3)  
Race (%) black 67 (7.1) 51 (7.7) 16 (5.7) 0.429
other 58 (6.1) 43 (6.5) 15 (5.4)  
white 819 (86.8) 570 (85.8) 249 (88.9)  
Primary.site (%) Aix of bones 389 (41.2) 274 (41.3) 115 (41.1) 0.606
Limb bones 514 (54.4) 364 (54.8) 150 (53.6)  
Other 41 (4.3) 26 (3.9) 15 (5.4)  
Marital (%) no 344 (36.4) 249 (37.5) 95 (33.9) 0.333
yes 600 (63.6) 415 (62.5) 185 (66.1)  
Sequence.number (%) more 188 (19.9) 133 (20.0) 55 (19.6) 0.963
only one 756 (80.1) 531 (80.0) 225 (80.4)  
Tumor.size (mean (SD)) NA 79.20 (66.42) 79.94 (72.61) 77.45 (48.77) 0.598
Lymph (%) No 915 (96.9) 646 (97.3) 269 (96.1) 0.536
unknow 20 (2.1) 13 (2.0) 7 (2.5)  
yes 9 (1.0) 5 (0.8) 4 (1.4)