Table 5 Multivariate COX regression analysis no comparing no recurrence and late recurrence

Number of mass

 1

Reference

0.002

 2—7

1.441 (1.01 – 2.056)

0.044

  ≥ 8

2.242 (1.436 – 3.502)

 < 0.001

Mass size

  < 3 cm

Reference

  >  = 3 cm

0.97 (0.64 – 1.472)

0.887

Tumor shape

 Papillary

Reference

 Sessile/Flat erythematous

0.86 (0.412 – 1.795)

0.688

Resection depth

 Submucosa

Reference

0.277

 Muscle

0.597 (0.308 – 1.158)

0.127

 Perivesical fat

1.001 (0.124 – 8.07)

0.999

Complete TURB

 No

Reference

 Yes

1.313 (0.407 – 3.144)

0.814

Grade

 Low grade

Reference

 High grade

0.697 (0.5 – 0.973)

0.034

 CIS

0.654 (0.237 – 1.804)

0.412