Table 3.

Pre-operative comorbidity status

Frequency of pancreaticoduodenectomy	Time frame	Percent of patients with a major comorbidity
1–3 (≤1 per year)	1992–1994	35%
	2001–2003	36%
	2010–2012	31%
	Overall	34%
4–9 (>1 & ≤3 per year)	1992–1994	26%
	2001–2003	33%
	2010–2012	40%
	Overall	23%
10–18 (>3 & ≤6 per year)	1992–1994	24%
	2001–2003	40%
	2010–2012	31%
	Overall	34%
19–36 (>6 & ≤12 per year)	1992–1994	40%
	2001–2003	38%
	2010–2012	34%
	Overall	36%
>36 (>12 per year)	1992–1994	22%
	2001–2003	33%
	2010–2012	34%
	Overall	33%