Table 3. Multivariate analysis using the seven prognostic variables in the univariate analyses.

	Multivariate analysis
Variables	Risk ratio (95% CI)	P-value
Peritoneal tumour spread at PCS
Localised to the pelvis	1.00
Extended beyond the pelvis	0.80 (0.42–1.76)	0.540
Stage
I/II	1.00
III/IV	0.90 (0.22–5.60)	0.893
Aortic lymph node metastases at PCS
Absent	1.00
Present	1.23 (0.56–2.64)
Not assessed	1.78 (0.61–5.33)	0.088
Disease-free interval (months)
⩾12	1.00
<12	2.45 (1.11–5.39)	0.027
Liver metastasis
Absent	1.00
Present	4.00 (1.40–10.03)	0.013
No. of recurrent tumours
Solitary	1.00
Multiple	3.73 (1.79–9.58)	<0.001
Size of maximum tumour (cm)
<6	1.00
⩾6	7.43 (3.12–18.92)	<0.001

PCS=primary cytoreductive surgery.