Abstract
Background The study was designed to examine the epidemiology of appendicitis and risk factors of perforation and appendectomy. Methods Retrospective analysis of the California Office of Statewide Health Planning and Development Patient Discharge Data was performed from 1995 to 2009. Patients with appendicitis were identified by ICD-9 diagnosis code. Population statistics from the RAND Corporation were used to calculate incidence rates. Risk factors of perforation and appendectomy were also calculated. Results A total of 608,116 patients with appendicitis (70 % non-perforated) were included. The incidence increased at an average rate of 0.5 cases/100,000 population/ year (p <0.001), with annual incidence peaking during the third quarter. Children age 10-14 had the highest rates of appendicitis (169.6 cases/100,000). The lifetime cumulative incidence rate is 9.0 %. Appendicitis is most common in whites and Hispanics and less common in African Americans and Asians. Risks of perforation include Hispanic or Asian race, young or old age, and nonprivate insurance. The adjusted odds of appendectomy increased since 1995 in patients with non-perforated appendicitis (OR 1.5, 95 % CI (1.3-1.7); p <0.001), but it decreased in patients with perforated appendicitis (OR 0.4, 95 % CI (0.4-0.5); p <0.001). Conclusions This is the largest epidemiological study of appendicitis to our knowledge in recent years. Incidence has increased over time and is higher in the summer months. Whites and Hispanics have higher rates of appendicitis, but Hispanics and Asians and patients with non-private insurance, have higher odds of perforation. Surgical management of perforated appendicitis has decreased over time. It is unknown why the incidence has increased, displays seasonality, and varies by race.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2787-2794 |
| Number of pages | 8 |
| Journal | World Journal of Surgery |
| Volume | 36 |
| Issue number | 12 |
| DOIs | |
| State | Published - Jan 1 2012 |
Fingerprint
ASJC Scopus subject areas
- Surgery
Cite this
Examining a common disease with unknown etiology : Trends in epidemiology and surgical management of appendicitis in California, 1995-2009. / Anderson, Jamie; Bickler, Stephen W.; Chang, David C.; Talamini, Mark A.
In: World Journal of Surgery, Vol. 36, No. 12, 01.01.2012, p. 2787-2794.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Examining a common disease with unknown etiology
T2 - Trends in epidemiology and surgical management of appendicitis in California, 1995-2009
AU - Anderson, Jamie
AU - Bickler, Stephen W.
AU - Chang, David C.
AU - Talamini, Mark A.
PY - 2012/1/1
Y1 - 2012/1/1
N2 - Background The study was designed to examine the epidemiology of appendicitis and risk factors of perforation and appendectomy. Methods Retrospective analysis of the California Office of Statewide Health Planning and Development Patient Discharge Data was performed from 1995 to 2009. Patients with appendicitis were identified by ICD-9 diagnosis code. Population statistics from the RAND Corporation were used to calculate incidence rates. Risk factors of perforation and appendectomy were also calculated. Results A total of 608,116 patients with appendicitis (70 % non-perforated) were included. The incidence increased at an average rate of 0.5 cases/100,000 population/ year (p <0.001), with annual incidence peaking during the third quarter. Children age 10-14 had the highest rates of appendicitis (169.6 cases/100,000). The lifetime cumulative incidence rate is 9.0 %. Appendicitis is most common in whites and Hispanics and less common in African Americans and Asians. Risks of perforation include Hispanic or Asian race, young or old age, and nonprivate insurance. The adjusted odds of appendectomy increased since 1995 in patients with non-perforated appendicitis (OR 1.5, 95 % CI (1.3-1.7); p <0.001), but it decreased in patients with perforated appendicitis (OR 0.4, 95 % CI (0.4-0.5); p <0.001). Conclusions This is the largest epidemiological study of appendicitis to our knowledge in recent years. Incidence has increased over time and is higher in the summer months. Whites and Hispanics have higher rates of appendicitis, but Hispanics and Asians and patients with non-private insurance, have higher odds of perforation. Surgical management of perforated appendicitis has decreased over time. It is unknown why the incidence has increased, displays seasonality, and varies by race.
AB - Background The study was designed to examine the epidemiology of appendicitis and risk factors of perforation and appendectomy. Methods Retrospective analysis of the California Office of Statewide Health Planning and Development Patient Discharge Data was performed from 1995 to 2009. Patients with appendicitis were identified by ICD-9 diagnosis code. Population statistics from the RAND Corporation were used to calculate incidence rates. Risk factors of perforation and appendectomy were also calculated. Results A total of 608,116 patients with appendicitis (70 % non-perforated) were included. The incidence increased at an average rate of 0.5 cases/100,000 population/ year (p <0.001), with annual incidence peaking during the third quarter. Children age 10-14 had the highest rates of appendicitis (169.6 cases/100,000). The lifetime cumulative incidence rate is 9.0 %. Appendicitis is most common in whites and Hispanics and less common in African Americans and Asians. Risks of perforation include Hispanic or Asian race, young or old age, and nonprivate insurance. The adjusted odds of appendectomy increased since 1995 in patients with non-perforated appendicitis (OR 1.5, 95 % CI (1.3-1.7); p <0.001), but it decreased in patients with perforated appendicitis (OR 0.4, 95 % CI (0.4-0.5); p <0.001). Conclusions This is the largest epidemiological study of appendicitis to our knowledge in recent years. Incidence has increased over time and is higher in the summer months. Whites and Hispanics have higher rates of appendicitis, but Hispanics and Asians and patients with non-private insurance, have higher odds of perforation. Surgical management of perforated appendicitis has decreased over time. It is unknown why the incidence has increased, displays seasonality, and varies by race.
UR - http://www.scopus.com/inward/record.url?scp=84877134786&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84877134786&partnerID=8YFLogxK
U2 - 10.1007/s00268-012-1749-z
DO - 10.1007/s00268-012-1749-z
M3 - Article
C2 - 22948195
AN - SCOPUS:84877134786
VL - 36
SP - 2787
EP - 2794
JO - Presentations from the 9th Annual Electric Utilities Environmental Conference
JF - Presentations from the 9th Annual Electric Utilities Environmental Conference
SN - 0364-2313
IS - 12
ER -