Table 2. Univariate and multivariate Cox regression analysis on the contribution of various potential prognostic parameters to progression-free survival of patients with non-muscle-invasive BC.

Parameters	Categories	P-value	OR	95% CI
Univariate Cox regression analysis
AIB1 expression	Normal vs over	0.003	3.182	1.476–6.862
Gender	Male vs female	0.145	0.407	0.122–1.361
Age (years)	⩽60 vs >60	0.273	1.564	0.702–3.483
pT status	pTa vs pT1	0.002	3.252	1.522–6.946
WHO grade	Low vs high	0.014	2.589	1.211–5.537
Multiplicity	Unifocal vs multifocal	0.357	1.426	0.670–3.036
Tumour size (cm)	⩽2.0 vs >2.0	0.021	2.603	1.158–5.847
Intravesical instillation	MMC vs THP	0.944	0.983	0.618–1.564
Multivariate Cox regression analysis
AIB1 expression	Normal vs over	0.009	2.861	1.307–6.264
pT status	pTa vs pT1	0.003	3.296	1.520–7.148
WHO grade	Low vs high	0.016	2.585	1.196–5.586
Tumour size (cm)	⩽2.0 vs >2.0	0.068	2.144	0.945–4.866

Abbreviations: CI=confidence interval; MMC=mitomycin C; OR=odds ratio; pT=pathological T(TNM); THP=pirarubicin; WHO=World Health Organisation.