Table 1

Hospital and patient factors related to rate of normal appendix removal

Factors Number of primary appendicectomy performed Number with a
removal of
normal appendix 		% With a
removal of
normal appendix 		p Value
Primary appendicectomy volume of the admitted hospital<0.001
 <701 22715312.5
 70–1845 24493617.9
 185–3509 335151916.3
 >35027 255456216.7
Bed size of the admitted hospital<0.05
 <503 04545615.0
 50–1198 238133116.2
 120–19913 892236517.0
 ⩾20017 884301716.9
Teaching status of the admitted hospital<0.05
 Teaching17 021292417.2
 Non-teaching26 038424516.3
Sex<0.001
 Male23 262244510.5
 Female19 799472523.9
Age (y)<0.001
 0–148 72896811.1
 15–2917 610283316.1
 30–449 721175018.0
 ⩾457 002161923.1
Admission status<0.001
 Emergent32 110444413.8
 Urgent8 462140516.6
 Elective2 489132153.1
Comorbidity<0.001
 No40 992656616.0
 Yes2 03660029.5
Time to surgery (at individual level)<0.001
 0 day32 752402312.3
 ⩾1 day10 265312630.5
Time to surgery (at hospital level; measured by percentage of ⩾1 day to surgery)<0.001
 <15%8 276150218.2
 15% to <18%13 100200415.3
 18% to <25%14 439245217.0
 ⩾25%7 246121216.7