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. 2019 Jan 2;145(3):737–746. doi: 10.1007/s00432-018-02826-7

Table 1.

Multivariable logistic regression for analyzing the demographic and related clinical characteristics for developing BM in patients diagnosed with initial primary NSCLC

Variables Number of NSCLC patients (2010–2015) OR (95% CI) P value
With bone metastases (%) Without bone metastases (%)
Age 0.976 (0.951–1.001) 0.055
 < 50 448 (0.71%) 2143 (3.37%) 1.00
 50–59 1547 (2.44%) 9401 (14.80%) 0.938 (0.824–1.067) 0.331
 60–69 2443 (3.85%) 18,108 (28.51%) 0.929 (0.821–1.051) 0.243
 70–79 2134 (3.36%) 18,060 (28.44%) 0.927 (0.818–1.051) 0.236
 ≥ 80 914 (1.44%) 8307 (13.08%) 0.881 (0.768–1.011) 0.070
Race 1.038 (0.994–1.083) 0 0.089
 White 5782 (9.10%) 45,252 (71.26%) 1.00
 Black 1004 (1.58%) 6467 (10.18%) 1.014 (0.935–1.099) 0.741
 Other 700 (1.10%) 4300 (6.77%) 1.060 (0.964–1.166) 0.226
Marital status
 Unmarried 3315 (5.22%) 25,929 (40.83%) 1.00
 Married 4171 (6.57%) 30,090 (47.38%) 1.061 (1.004–1.121) 0.036
Sex
 Male 4375 (6.89%) 29,133 (45.88%) 1.00
 Female 3111 (4.90%) 26,886 (42.34%) 0.815 (0.771–0.861) < 0.001
Tumor histology 0.675 (0.641–0.710) < 0.001
 Adenocarcinoma 5231 (8.24%) 33,262 (52.38%) 1.00
 Squamous cell carcinoma 1874 (2.95%) 21,274 (33.50%) 0.516 (0.485–0.549) < 0.001
 Other 381 (0.60%) 1483 (2.34%) 1.005 (0.873–1.156) 0.948
Laterality 0.972 (0.923–1.023) 0 0.269
 Left 3008 (4.74%) 22,705 (35.75%) 1.00
 Right 4326 (6.81%) 32,871 (51.76%) 0.964 (0.913–1.019) 0.194
 Paired 152 (0.24%) 443 (0.70%) 0.860 (0.695–1.063) 0.164
T stage 1.287 (1.251–1.324) < 0.001
 T1 616 (0.97%) 15,456 (24.34%) 1.00
 T2 2039 (3.21%) 19,431 (30.60%) 1.798 (1.631–1.983) < 0.001
 T3 2088 (3.29%) 11,120 (17.51%) 2.272 (2.052–2.516) < 0.001
 T4 2743 (4.32%) 10,012 (15.77%) 2.536 (2.290–2.809) < 0.001
N stage 1.568 (1.527–1.610) < 0.001
 N0 1484 (2.34%) 30,334 (47.77%) 1.00
 N1 650 (1.02%) 5881 (9.26%) 1.709 (1.544–1.892) < 0.001
 N2 3732 (5.88%) 15,400 (24.25%) 2.862 (2.671–3.068) < 0.001
 N3 1620 (2.55%) 4404 (6.93%) 3.457 (3.170–3.771) < 0.001
Grade 1.272 (1.218–1.328) < 0.001
 1 356 (0.56%) 6088 (9.59%) 1.00
 2 2282 (3.59%) 22,606 (35.60%) 1.470 (1.298–1.666) < 0.001
 3 4681 (7.37%) 26,428 (41.62%) 1.695 (1.500–1.915) < 0.001
 4 167 (0.26%) 897 (1.41%) 1.568 (1.247–1.971) < 0.001
Brain metastases
 No 5735 (9.03%) 52,082 (82.01%) 1.00
 Yes 1751 (2.76%) 3937 (6.20%) 1.946 (1.812–2.089) < 0.001
Liver metastases
 No 5818 (9.16%) 54,583 (85.95%) 1.00
 Yes 1668 (2.63%) 1436 (2.26%) 5.846 (5.383–6.349) < 0.001
Lung metastases
 No 5155 (8.12%) 51,079 (80.43%) 1.00
 Yes 2331 (3.67%) 4940 (7.78%) 2.052 (1.917–2.197) < 0.001