Table 4.

The association between variables and the development of complications in univariate analysis

Variable	n	Category	Hazard ratio (95% CI)	p-value
Length of stay	111	≤1 day	1	0.23
		≥2 days	1.77 (0.70–4.47)
Time with catheter	76	≤5 days	1
		>5 days	4.67 (1.75–12.5[0])	0.002
Lasing energy	116	–	1.47* (1.00–2.16)	0.05
Preoperative PSA	78	≤5	1	0.89
		>5	1.07 (0.42–2.77)
Postoperative PSA	41	≤5	1	0.77
		>5	1.17 (0.42–3.28)
Preoperative Qmax	11	–	0.56** (0.19–1.64)	0.29
Postoperative Qmax	18	–	0.89** (0.51–1.55)	0.68

CI = confidence interval; PSA = prostate specific antigen; Qmax = maximum flow rate

^*Hazard ratio for a 50,000J increase in energy

^**Hazard ratio for a 5-unit increase in Qmax