Epidemiology and socioeconomic features of appendicitis in Taiwan: a 12-year population-based study

Table 4 Descriptive statistics of the sample population for LIP and NP patients with appendicitis from Taiwan’s NHIRD (2000–2011)

Year	SUM	Normal population		Low-income population
Year	SUM	n	%	n	%
2000	27,048	26,839	99.23 %	209	0.77 %
2001	27,941	27,677	99.06 %	264	0.94 %
2002	27,480	27,188	98.94 %	292	1.06 %
2003	25,099	24,819	98.88 %	280	1.12 %
2004	24,828	24,540	98.84 %	288	1.16 %
2005	23,686	23,401	98.80 %	285	1.20 %
2006	23,057	22,728	98.57 %	329	1.43 %
2007	23,122	22,831	98.74 %	291	1.26 %
2008	23,140	22,807	98.56 %	333	1.44 %
2009	23,365	23,013	98.49 %	352	1.51 %
2010	23,239	22,855	98.35 %	384	1.65 %
2011	22,586	22,212	98.34 %	374	1.66 %
Sum	294,591	290,910	98.75 %	3,681	1.25 %

The total number of patients (294,544) was smaller than the sum of the number of NP and LIP patients (294,591) because some patients belonged to different SES groups when they were readmitted to the hospital at different times

ISSN: 1749-7922