Table 2. Univariate analysis of prognostic factors and treatment (Cox regression).

Characteristic	β	s.e.	P-value
Agea	0.0026	0.0053	0.6
Sex
Male	0	—	0.8
Female	−0.04	0.12
WHO performance status
0	0	—	<0.001b
1	0.32	0.14
2	1.12	0.16
Months since first diagnosis of renal carcinomaa	−0.0040	0.0016	0.02
Transformed months since first diagnosis of metastasesc	−0.19	0.04	<0.001
Nephrectomy
No	0	—	0.07
Yes	−0.21	0.11
Metastases
Single	0	—	0.3
Multiple	0.17	0.15
Transformed haemoglobind	35.9	4.4	<0.001
White cell counta	0.087	0.013	<0.001
Serum calciuma	0.99	0.29	0.001
Treatment
MPA	0	—	0.009
Interferon-α	−0.29	0.11

Values of β are log hazard ratios. s.e.=standard error.

^aLinear function.

^bTrend test.

^cLog transformation.

^d1/haemoglobin.