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 | ||
|---|---|---|---|---|---|
| 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