Table 3 Baseline characteristics between surgery and non-surgery groups
From: Surgical efficacy and survival prediction of patients with unspecified malignant bone tumors
Factors | Primary tumor surgery (Unmatched) | p value | Primary tumor surgery (Propensity score matching) | p value | ||
|---|---|---|---|---|---|---|
Yes (n = 213) | No (n = 187) | Yes (n = 86) | No (n = 86) | |||
Age (yrs, mean ± SD) | 52.6 ± 19.5 | 62.8 ± 19.3 | < 0.001 | 56.3 ± 18.7 | 58.1 ± 19.3 | 0.533 |
Race (n,%) | 0.107 | 0.142 | ||||
Black | 20 (9.4) | 28 (15.0) | 6 (7.0) | 14 (16.3) | ||
White | 181 (85.0) | 142 (75.9) | 77 (89.5) | 68 (79.1) | ||
Othersa | 10 (4.7) | 13 (7.0) | 3 (3.5) | 4 (4.6) | ||
Sex (n,%) | 0.010 | 0.879 | ||||
Female | 91 (42.7) | 104 (55.6) | 41 (47.7) | 42 (48.8) | ||
Male | 122 (57.3) | 83 (44.4) | 45 (52.3) | 44 (51.2) | ||
Diagnosis year (n,%) | 0.160 | 0.578 | ||||
≤ 2000 | 56 (26.3) | 38 (20.3) | 20 (23.3) | 17 (19.8) | ||
> 2000 | 157 (73.7) | 149 (79.7) | 66 (76.7) | 69 (80.2) | ||
Region (n,%) | 0.935 | 0.852 | ||||
Southeast | 17 (8.0) | 17 (9.1) | 6 (6.9) | 8 (9.3) | ||
Pacific coast | 96 (45.1) | 80 (42.8) | 36 (41.9) | 39 (45.3) | ||
Northern plains | 19 (8.9) | 19 (10.2) | 9 (10.5) | 9 (10.5) | ||
East | 81 (38.0) | 71 (38.1) | 35 (40.7) | 30 (34.9) | ||
Tumor site (n,%) | < 0.001 | 0.070 | ||||
Limbs | 128 (60.1) | 66 (35.3) | 34 (39.5) | 39 (45.3) | ||
Spine | 45 (21.1) | 29 (15.5) | 23 (26.8) | 11 (12.8) | ||
Othersb | 40 (18.8) | 92 (49.2) | 29 (33.7) | 36 (41.9) | ||
Tumor laterality (n,%) | 0.277 | 0.097 | ||||
Left | 82 (38.5) | 57 (30.8) | 27 (31.4) | 32 (37.2) | ||
Right | 73 (34.3) | 66 (35.3) | 25 (29.1) | 32 (37.2) | ||
Tumor extent | < 0.001 | 0.032 | ||||
Localized | 76 (35.7) | 47 (25.1) | 21 (24.4) | 20 (23.3) | ||
Regional | 84 (39.4) | 28 (15.0) | 36 (41.9) | 20 (23.3) | ||
Distant | 36 (16.9) | 72 (38.5) | 29 (33.7) | 36 (41.9) | ||
Tumor size (mm, mean ± SD) | 71.5 ± 44.9 | 80.5 ± 46.8 | 0.204 | 77.6 ± 52.0 | 80.1 ± 46.5 | 0.812 |
Pathology grade (n,%) | 0.041 | 0.568 | ||||
I: Well differentiated | 11 (51.6) | 3 (1.6) | 3 (3.5) | 1 (1.2) | ||
II: Moderately differentiated | 27 (12.7) | 7 (3.7) | 8 (9.3) | 5 (5.8) | ||
III: Poorly differentiated | 30 (14.1) | 25 (13.4) | 11 (12.8) | 14 (16.3) | ||
IV: Undifferentiated | 79 (37.1) | 58 (31.0) | 35 (40.7) | 35 (40.7) | ||
First tumor diagnosis (n,%) | 0.042 | 0.308 | ||||
Yes | 165 (77.5) | 128 (68.5) | 21 (24.4) | 27 (31.4) | ||
No | 48 (22.5) | 59 (31.6) | 65 (75.6) | 59 (68.6) | ||
Hispanic (n,%) | 0.813 | 0.670 | ||||
No | 184 (86.4) | 164 (87.7) | 74 (86.0) | 72 (83.7) | ||
Yes | 29 (13.6) | 23 (12.3) | 12 (14.0) | 14 (16.3) | ||
Marital status (n,%) | 0.001 | 0.520 | ||||
Single | 111 | 80 | 17 (19.8) | 17 (19.8) | ||
Married | 53 | 29 | 53 (61.6) | 47 (54.7) | ||
Othersc | 38 | 59 | 16 (18.6) | 22 (25.5) | ||
Family income (USD, mean ± SD) | 80,780 ± 20,320 | 74,620 ± 19,630 | 0.002 | 74,140 ± 19,590 | 75,830 ± 20,110 | 0.570 |