Table 2.

Demographics and risk factors

Risk/demographic factor		Total	Moderate or severe postoperative complications (n/%)	p value	Odds ratio (95% CI)
Age group				0.05	0.92 (0.82–1.02)
	<20	18	1/5.6
	20–29	52	6/11.5
	30–39	66	18/27.3
	40–49	194	20/21.3
	50–59	191	32/16.8
	60–69	254	40/15.7
	70–79	156	20/12.8
	>80	35	2/5.7
ASA group				0.25	1.04 (0.83–1.30)
	1	259	35/13.5
	2	351	67/19.1
	3	221	34/15.4
	4	19	2/10.5
	5	0	0
	Missing data	16
Body mass index				0.01	1.74 (1.15–2.63)
	<30	617	88/14.3
	>30	187	42/22.5
	Missing data	62
Previous sclerotherapy				0.01	1.77 (1.17–2.70)
	Yes	71	19/26.8
	No	795	120/15.1
Size of the hydrocele				0.08	1.5 (0.97–2.33)
	Over 300 ml	386	75/19.4
	Under 300 ml	254	35/13.8
	Missing data	227
Bilateral operation				0.39	1.42 (0.64–3.16)
	Yes	38	8/21.1
	No	828	131/15.8
Antithrombotic/anticoagulative medication				0.73	1.10 (0.70–1.70)
	Yes	190	32/16.8
	No	676	107/15.8
Antibiotic prophylaxis				0.26	1.30 (0.82–2.04)
	Yes	152	29/19.1
	No	714	110/15.4
Experience of the surgeon				0.02	0.73 (0.56–0.96)
	Junior resident	136	14/10.3
	Senior resident	261	39/14.9
	Consultant	469	86/18.3
Surgical technique				0.75	0.83 (0.43–1.61)
	Winkelmann/Jaboulay	737	122/16.6
	Lord	78	11/14.1
	Resection	39	6/15.4
	Orchiectomy	1	0
	Missing data	10

ASA = American Society of Anesthesiologists; CI = confidence interval.