Table 3

Adjusted perforation rates by patient and hospital characteristics, appendicitis patients in Taiwan (aged 15 or above), 1997–2001

Characteristics
Adjusted ruptured rate (%)
95% CI

Mental disorder status


     No major mental disorder
23.8
23.5–24.1
     Schizophrenia
46.9
40.8–53.2
     Affective psychosis
26.5
19.3–35.1
     Other major mental disorders
33.1
21.8–46.8
Gender


     Female
20.4
20.1–20.8
     Male
27.3
26.9–27.7
Age (years)


     15–24
18.5
18.1–19.0
     25–34
18.5
18.0–19.0
     35–44
23.7
23.1–24.3
     45–54
29.6
28.8–30.5
     55–64
36.6
35.5–37.8
     65–74
42.7
41.3–44.0
     ≥ 75
51.1
49.3–52.9
Ethnicity


     Non-aboriginal
23.8
23.5–24.1
     Aboriginal
26.2
24.6–27.9
SES


     ≥ NT$40,000
23.0
22.3–23.7
     NT$20,000 ~ NT$39,999
23.5
23.0–24.1
     <NT$20,000
23.8
23.3–24.3
     Without a well-defined monthly wage
24.6
24.1–25.1
Hospital ownership


     Public
20.6
20.0–21.3
     Nonprofit
23.7
23.2–24.1
     Profit
26.4
25.7–27.0
Hospital accreditation level


     District Hospital-nonteaching
22.6
21.7–23.6
     District Hospital-teaching
17.9
17.3–18.6
     Regional Hospital
24.5
24.0–25.0
     Medical Center
28.8
27.9–29.7
Hospital volume


     ≥ 360
23.2
22.5–24.0
     210–360
23.3
22.7–23.9
     80–210
23.9
23.3–24.5
     0–80
25.2
24.3–26.0
Hospital's geographic location


     Taipei Branch
22.1
21.6–22.6
     Northern Branch
22.1
21.4–22.8
     Central Branch
27.4
26.6–28.1
     Southern Branch
26.2
25.4–27.0
     Kao-Ping Branch
24.4
23.8–25.1
     Eastern Branch
20.5
19.0–22.2
Year


     1997
26.1
25.5–26.8
     1998
25.4
24.7–26.0
     1999
24.7
24.1–25.3
     2000
22.2
21.6–22.8
     2001
21.5
20.9–22.1

Tsay et al. BMC Public Health 2007 7:331   doi:10.1186/1471-2458-7-331