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Table 2 Risk factor analysis for pre-PCI brain metastasis

From: Patterns of brain metastasis immediately before prophylactic cranial irradiation (PCI): implications for PCI optimization in limited-stage small cell lung cancer

Covariates

Univariate

Multivariate

RR (95% CI)

P

RR (95% CI)

P

Age at diagnosis

0.976 (0.924–1.032)

0.400

  

Gender

0.510 (0.107–2.437)

0.399

  

Smoking

3.781 (0.822–17.400)

0.088

4.376 (0.895–21.394)

0.068

T stage (1–2 vs 3–4)

1.383 (0.546–3.502)

0.494

1.099 (0.411–2.941)

0.851

N stage (0–2 vs 3)

1.458 (0.499–4.259)

0.490

1.389 (0.456–4.235)

0.564

CRT-D (months)

1.340 (0.981–1.831)

0.066

1.406 (1.007–1.964)

0.045*

  1. Abbreviation: PCI Prophylactic cranial irradiation, RR Risk ratio, CI Confidence interval, CRT-D Chemoradiotherapy duration. Age and CRT-D as continuous variables. Binary logistic regression was employed for analysis. (*) statistically significant