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Table 2 Comparison of median and IQR hospital LOS for specified conditions (MDC) for the years 1998/1999 and for the years 2010/2011; mean annual change in the period 1998–2011 based on the slope of the regression line adjusted for sex and age group, and its deviation from zero

From: Trends in hospital admissions at a Department for Infectious Diseases in Italy from 1995 to 2011 and implications for health policies

MDC Description N of patients (1998–2011) Median hospital LOS (IQR) in 1998/1999 Median hospital LOS (IQR) in 2010/2011 Mann Whitney U test Slope (±S D) Deviation from zero p-value, sex- and age-adjusted
  All the patients 22649 10 (6–18) 10 (6–18) 0.20 −0.02 ± 0.02 0.36b
01 D&D of the nervous system 645 12 (7–18) 14 (8–20.5) 0.23 0.23 ± 0.12 0.06b
02 D&D of the eye 59 8 (5.5-18.5) 9 (5–18) 1.00 / /
03 D&D of the ear. nose. mouth and throat 327 6 (4.5-8) 6 (3–10) 0.86 0.003 ± 0.09 0.97b
04 D&D of the respiratory system 2565 10 (6–17) 9 (6–15) 0.42 −0.07 ± 0.06 0.24b
05 D&D of the cardiovascular system 428 9.5 (5–19) 16.5 (9–42) 0.0006 1.47 ± 0.24 <0.0001 a
06 D&D of the digestive system 923 8 (4–13) 11 (6–17) 0.0015 0.002 ± 0.09 0.98b
07 D&D of liver. gallbladder and pancreas 2980 11 (6–18) 9 (5–14) 0.0018 −0.24 ± 0.05 <0.0001 b
08 D&D of the musculoskeletal system and connective tissue 619 15 (8–22) 19.5 (11.5-33) 0.0091 0.2 ± 0.21 0.32b
09 D&D of the skin. subcutaneous tissue and breast 865 7 (4–11) 10 (6–17) 0.0001 0.17 ± 0.09 0.06b
10 Endocrine. nutritional and metabolic diseases and disorders 70 8 (6–11.5) 8.5 (4.5-10.5) 0.95 / /
11 D&D of the kidney and urinary tract 423 8 (5.5-14.5) 9 (5–15) 0.95 −0.20 ± 0.15 0.17b
12 D&D of the male reproductive tract 62 8 (5.5-14) 8 (5.5-10.5) 0.90 −0.47 ± 0.39 0.24
13 D&D of the female reproductive tract 29 12 (3.5-21.5) 14 (8.5-20.5) 0.79 / /
14 Pregnancy, childbirth and puerperium 2 / / / / /
15 D&D of the neonatal period 1 / / / / /
16 D&D of blood. myelopoietic and immune system 214 10 (7-229 11 (6.5-18) 0.61 −0.25 ± 0.18 0.16
17 Diseases and myeloproliferative disorders and poorly differentiated tumors 374 4 (2–15) 9.5 (5–16.5) 0.06 0.003 ± 0.20 0.99
18 Infectious and parasitic diseases (systemic or unspecified sites) 2811 7 (4–11) 9 (5–20) <0.0001 0.26 ± 0.05 <0.0001 b
19 Diseases and Mental Disorders 27 7 (4–14) / / / /
20 Abuse of alcohol / drug induced organic mental disorders 27 3.5 (2.5-8.5) / / / /
21 Injury. poisoning and toxic effects of drugs 124 5.5 (3–10) 8 (4.5-28) 0.06 0.75 ± 0.35 0.034
22 Burns 2 / / / / /
23 Factors influencing health status and use of health services 53 7 (3–9) / / / /
24 Multiple relevant trauma 3 / / / / /
25 HIV infection 8870 12 (7–22) 10 (6–18) 0.0044 −0.19 ± 0.04 <0.0001
  Pre MDC 76 53 (11–69) 55.5 (24.5-74) 0.95 / /
  other DRG 70 18 (17–22) / / / /
  1. MDC with less than 100 observations have been excluded in the multivariate model adjusted for sex and age group.
  2. a= significantly associated with sex; b= significantly associated with age (≥45 years).
  3. LOS length of stay, D&D diseases and disorders, IQR interquartile range.
  4. Bold indicates statistically significant results.
  5. MDC Major Diagnostic Category, SD standard deviation.