eTable 2. Characteristics of inpatient cases with appendectomy as sole intervention for appendicitis.

		2010		2011		2012		2013		2014		2015		2016		2017
		n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%
Total number of inpatient cases		113 614	100.0	113 975	100.0	111 957	100.0	108 437	100.0	107 322	100.0	104 922	100.0	102 997	100.0	102 464	100.0
Incidence per 100 000 persons		139		142		139		134		132		128		125		124
Incidence per 100 000 persons (standardized by age group, in relation to 2010)		139		142		139		134		132		127		124		123
Age (years)	< 15	22 273	19.6	21 451	18.8	19 991	17.9	18 256	16.8	16 893	15.7	15 891	15.1	15 139	14.7	14 944	14.6
	15–35	53 165	46.8	53 537	47.0	53 171	47.5	52 412	48.3	51 967	48.4	50 151	47.8	48 692	47.3	47 331	46.2
	> 35	38 176	33.6	38 987	34.2	38 795	34.7	37 769	34.8	38 462	35.8	38 880	37.1	39 166	38.0	40 189	39.2
Gender	Female	59 734	52.6	60 236	52.9	58 890	52.6	57 071	52.6	56 563	52.7	53 715	51.2	51 944	50.4	51 173	49.9
Length of hospital stay (days)	Mean (median)	5.1 (4)		4.9 (4)		4.8 (4)		4.7 (4)		4.6 (4)		4.6 (4)		4.6 (4)		4.4 (4)
Severity	Uncomplicated appendicitis	93 135	82.0	92 911	81.5	90 824	81.1	87 574	80.8	86 559	80.7	83 362	79.5	81 140	78.8	79 906	78.0
	Complicated appendicitis	20 479	18.0	21 064	18.5	21 133	18.9	20 863	19.2	20 763	19.3	21 560	20.5	21 857	21.2	22 558	22.0
Surgical approach	Laparoscopic	86 500	76.1	91 633	80.4	93 663	83.7	93 697	86.4	95 378	88.9	95 053	90.6	94 687	91.9	95 441	93.1
	Open	23 365	20.6	18 582	16.3	14 777	13.2	11 578	10.7	9009	8.4	6992	6.7	5578	5.4	4534	4.4
	Conversion	3728	3.3	3688	3.2	3441	3.1	3118	2.9	2908	2.7	2848	2.7	2704	2.6	2450	2.4
	Other or undefined	21	0.0	72	0.1	76	0.1	44	0.0	27	0.0	29	0.0	28	0.0	39	0.0
Type of surgery	Appendectomy	112 815	99.3	113 121	99.3	111 046	99.2	107 427	99.1	106 216	99.0	103 612	98.8	101 670	98.7	101 037	98.6
	Cecal resection	799	0.7	854	0.7	911	0.8	1010	0.9	1106	1.0	1310	1.2	1327	1.3	1427	1.4