Assessing the Validity and Cover Rate of the National Swedish Hernia Register

Figures & data

Table 1 Cover Rate of the Swedish Hernia Register from 2014 to 2018

Year	2014	2015	2016	2017	2018	Total
Hospitals visited	15	8	11	6	6	46
Hernia operations registered in Swedish Hernia Register	2660	3292	2364	1886	1643	11,845
Hernia operations in the medical records	2795	3314	2470	1964	1696	12,239
Cover rate	95%	99%	96%	96%	97%	97%

Table 2 Data Quality in the Swedish Hernia Register from 2013 to 2018

Year	2013	2014	2015	2016	2017	2018	Total
Hospitals visited	9	15	8	11	6	6	55
Cases with more the one error	13%	7%	10,0%	6%	8%	15%	9%
Variables validated	11,880	20,547	11,043	14,049	8100	8100	73,764
Number of errors	258	316	194	177	124	134	1264
Correct variables	98%	98%	98%	99%	98%	98%	98%
Number of cases examined	442	762	409	527	300	300	2740
Number of cases registered in Swedish Hernia Register	440	761	409	522	300	300	2732

Table 3 The Frequency of Errors in 10 Variables

Variable	Frequency in Relation to All Errors
ASA-score	17%
Date when the patient was placed on a waiting list for surgery	12%
Postoperative complications	10%
Fixation of the mesh	9%
Duration of surgery	7%
Date of admission and discharge from hospital	5%
Hernia anatomy	5%
Information regarding how the surgeon handled the nerves	4%
Type of anesthesia	4%
The handling of hernia sac	3%