Excess hospitalizations and in-hospital mortality associated with seasonal influenza in Italy: a 11-year retrospective study

Table 4 Average length of stay and cost of hospitalisation with primary diagnoses of influenza and cardiorespiratory diagnoses associated with influenza. Seasons 2008/09 – 2018/19, Italy

Season^a	Influenza (ICD9 code 487, primary)		Cardiorespiratory diseases^c
Season^a	Average length of stay (days)	Average cost (€)	Average length of stay (days)	Average cost (€)
2008/09	4.9	1581.1	10.3	4093.4
2009/10	5.1	2224.9	10.3	4979.8
2010/11	5.2	2221.4	10.3	5091.0
2011/12	5.1	1646.2	10.3	5166.1
2012/13	5.2	1985.5	10.3	5211.5
2013/14	4.7	1822.9	10.3	5258.0
2014/15	5.5	2822.4	10.4	5350.5
2015/16	5.6	2214.6	10.5	5444.7
2016/17	5.8	1956.6	10.4	5463.4
2017/18	6.1	2776.1	10.5	5497.5
2018/19	6.7	2496.9	10.5	5560.8
11-season mean	5.5	2159.0	10.4	5192.4
3-season mean^b	6.2	2409.9	11.1	4856.9

^aEach season extends from week 27 of one year to week 26 of the following year
^bIncludes the most recent seasons, namely 2016/17, 2017/18, and 2018/19
^cInclude ICD9 codes for influenza (ICD9 code 487); ii) pneumonia other than influenza (ICD9 480–486); iii) respiratory diseases (codes) other than influenza (ICD9 460–466, 480–487, 490–496, 500–508, 510–516, 518); iv) cardiovascular diseases (ICD9 410–414, 422, 427, 428, 430–435, 437, 438, 440)

ISSN: 1471-2334