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Table 2 Univariate analysis for overall survival according to each risk factor of Armstrong risk classification[10]

From: External validation of risk classification in patients with docetaxel-treated castration-resistant prostate cancer

Risk factor

Category

n

Median (months)

Hazard ratio

95% CI

p value*

Visceral metastases

no

74

20.3

1.00

5.51 - 68.83

<0.001

yes

4

3.9

19.47

Bone scan progression

no

63

25.8

1.00

2.00 - 7.14

<0.001

yes

15

9.1

3.78

Significant pain

no

54

25.8

1.00

1.72 - 5.17

<0.001

yes

24

8.7

2.98

Hemoglobin (g/dL)

>13.0

14

22.9

1.00

0.66 - 2.60

0.442

 

13.0

64

19.5

1.31

  
  1. Abbreviations: CI, confidence interval. *log rank test.