Table 3.

Univariate and multivariate modelling of patient risk factors for venous thrombosis

Risk factor		Venous thrombosis
Univariate analysis			Multivariate analysis
RR	95% CI	Siga	RR	95% CI	Sigb
Gender	Female	1.00
	Male	1.16	0.78–1.71	0.468
Age (years)	18–29	1.00
	30–45	0.68	0.26–1.74	0.422
	46–65	0.88	0.41–1.89	0.744
	>66	0.64	0.30–1.38	0.257
Reason for PICC	IVAB	1.00
	Chemotherapy	3.11	1.95–4.94	<0.001	1.13	0.38–3.35	0.827
	Other	1.21	0.54–2.66	0.642
	Multiple	0.52	0.07–3.81	0.521
Previous PICCs	0–1 Previous PICCs	1.00
	≥2 Previous PICCs	1.64	1.03–2.63	0.039	1.17	0.73–1.91	0.508
Arm side	Right	1.00
	Left	1.42	0.91–2.23	0.126
Catheter size	4 Fr	1.00
	5 Fr	2.18	1.40–3.40	0.001	1.61	1.00–258	0.046
	6 Fr	4.61	2.47–8.59	<0.001	2.93	1.53–5.63	<0.001
	7 Fr	2.81	1.51–5.25	0.001	1.60	0.83–3.07	0.155
Cancer diagnosis	N	1.00
	Y	3.86	2.63–5.66	<0.001	3.60	2.26–5.75	<0.001
Rhesus factor	Negative	1.00
	Positive	0.93	0.59–1.46	0.750
Blood group	0	1.00
	A	1.27	0.85–1.88	0.272	1.41	0.90–2.13	0.139
	B	1.84	1.12–3.03	0.031	2.13	1.19–3.82	0.011
	AB	1.86	0.93–3.71	0.076	1.44	0.66–3.17	0.360

CI, confidence interval; PICC, peripherally inserted central catheters; RR, relative risk.

^aBased on clustered log binomial generalized linear model.