Table 5.

Amputation rate following treatment of chronic wounds with tot with tests for response homogeneity

	N (Amputations)/N (Group)	Amputation Rate (%)	pa
Overall	97/4,127	2.4	NA
Gender
Male	47/2,305	2.0	0.1479
Female	50/1,822	2.7
Wound age
1 Month	27/1,028	2.6	<0.0001
2–3 Months	43/1,057	4.1
4–12 Months	19/1,475	1.3
>12 Months	8/567	1.4
Wound starting size
<2.5 cm2	25/1,039	2.4	0.6348
2.5–6.0 cm2	20/1,040	1.9
6.1–16 cm2	29/1,042	2.8
>16 cm2	23/1,006	2.3
Insurance
Medicaid	19/1,467	1.3	0.0002
Medicare	49/1,747	2.8
Other	5/357	1.4
Private	24/556	4.3
Wound locationa
Foot	50/1,900	2.6	0.0002
Leg	12/855	1.4
Other or not specified	12/504	2.4
Ankle	2/393	0.5
Toe	20/386	5.2
Sacral	1/89	1.1
ICD9 code
ICD9 250: Diabetes mellitus	45/1,410	3.2	0.0137
ICD9 459: Other disorders of circulatory system	2/454	0.4
ICD9 707: Chronic ulcer of skin	28/1,123	2.5
ICD9 998: Complication of surgical and medical care, not otherwise specified	5/246	2.0
Other	17/894	1.9

^ap-Value from Pearson's chi-squared test of response homogeneity.