Table 1.

AHTs of number of patients with BSIs with and without PICCs over 7 years of follow-up (2010–2017)

Year	No. of hospitalized patients	No. of installed PICCs		BSIs with PICCs		BSIs without PICCs		Total		pa	OR (95% CI)
		No. of patients	No. of events	No. of patients	No. of eventsb	No. of patients	No. of events	No. of patients	No. of events
2010	114 171	1 293	1 638	78	88	1 263	1 308	1 341	1 396	<0.01	4.8 (3.87–6.03)
2011	120 893	1 520	1 902	99	112	1 248	1 314	1 347	1 426	<0.01	5.6 (4.59–6.83)
2012	120 339	1 529	1 884	121	135	1 174	1 254	1 295	1 389	<0.01	7.2 (6.00–8.67)
2013	121 806	1 605	1 959	129	151	1 097	1 167	1 226	1 318	<0.01	8.5 (7.13–10.13)
2014	120 498	1 751	2 128	171	195	1 170	1 236	1 341	1 431	<0.01	9.6 (8.17–11.19)
2015	118 427	1 769	2 144	200	237	1 284	1 391	1 484	1 628	<0.01	10.3 (8.88–11.87)
2016	117 664	1 577	1 946	249	297	1 259	1 320	1 508	1 617	<0.01	15.6 (13,64–17.86)
2017	117 626	1 270	1 539	218	262	1 303	1 423	1 521	1 685	<0.01	16.5 (14.33–19.07)
Total	951 424	12 314	15 140	1 265	1 477	9 798	10 413	11 063	11 890	<0.01	9.6 (9.08–10.18)
AHT (p)	12 (0.98)	12 (0.7)		24 (<0.01)		9 (0.5)		30 (0.04)

AHTs were calculated using linear models, with each value demonstrating annual trend of mean number of patients in different conditions.

AHT, annual historical trend; BSI, bloodstream infection; CI, confidence interval; OR, odds ratio; PICC, peripherally inserted central catheter.

^aUncorrected bilateral chi-square tests, ORs, CIs and AHTs were calculated by R software (https://www.r-project.org/); p ≤ 0.05 was considered statistically significant. Comparisons were made between number of BSI events.

^bEvent is number of PICCs; number of PICCs can be larger than number of patients.