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Table 3 Criterion measure reliability – measure of agreement between gold standard experts

From: The Queensland high risk foot form (QHRFF) – is it a reliable and valid clinical research tool for foot disease?

QHRFF item

%

K(SE)

Strength of agreement [[37]]

General demographics

  

Indigenous status*

77.4

0.45 (0.17)

Moderate

Health professionals attending (in the past week)

Podiatrist

96.9

--

--

GP

81.2

0.78 (0.21)

Substantial

Nurse

84.4

0.47 (0.18)

Moderate

Orthotist

100

--

--

Physician

96.9

0.78 (0.21)

Substantial

Surgeon

100

1.00 (0.01)

Near perfect

Other

100

--

--

Medical co-morbidity history

  

Medical (diabetes) history

100

1.00 (0.01)

Near perfect

Diabetes duration#

 

0.94 (0.88–0.98)

Strong

Recent BGLs > 15 mmol/L*

90.6

0.81 (0.11)

Near perfect

HbA1c result#

 

0.93 (0.79–0.98)

Strong

Hypertension

87.5

0.60 (0.17)

Moderate

Dyslipidaemia

75.0

0.46 (0.16)

Moderate

Smoker

96.9

0.89 (0.11)

Near perfect

CVD

93.8

0.86 (0.10)

Near perfect

CKD

100

1.00 (0.01)

Near perfect

ESRF

96.9

--

--

Other (non-listed)

46.9

0.04 (0.09)

Slight

High-risk history

 

Neuropathy

93.8

0.48 (0.31)

Moderate

PAD

84.4

0.68 (0.13)

Substantial

Previous foot ulcer

84.4

0.45 (0.21)

Moderate

Current foot ulcer

96.9

--

--

New foot ulcer

83.9

0.58 (0.15)

Moderate

Previous amputation

90.6

0.81 (0.10)

Near perfect

Clinical diagnoses of high-risk factors

 

Neuropathy

96.9

0.65 (0.32)

Substantial

PAD*

77.4

0.61 (0.12)

Substantial

Acute Charcot

100

1.00 (0.01)

Near perfect

Foot deformity

81.3

0.46 (0.19)

Moderate

Risk classification*

96.8

--

--

Clinical diagnoses of foot disease

 

Ulcer type*

87.5

0.85 (0.08)

Near perfect

Combined surface area mm2#

 

0.73 (0.52-0.86)

Moderate

Clinical signs of infection*

84.3

0.68 (0.15)

Substantial

UTWCS grade#

 

0.56 (0.28–0.76)

Weak-moderate

Ulcer depth^

78.1

0.67 (0.13)

Substantial

Clinical management principles performed

 

Debrided ulcer/callus*

93.8

--

--

Dressing optimum*

96.9

--

--

Antibiotics required*

84.4

0.47 (0.19)

Moderate

Off-loading optimum*

68.8

0.41 (0.14)

Moderate

Footwear optimum*

65.6

0.28 (0.16)

Fair

Educated patient*

100

--

--

  1. K = Kappa; (SE) = Standard Error; % = Percentage agreement.
  2. -- = Measure of agreement was unable to be calculated because at least one variable was a constant.
  3. GP = General Practitioner; CVD = Cardiovascular Disease; ESRF = End Stage Renal Failure; PAD = Peripheral Arterial Disease; UTWCS = University of Texas Wound Classification System.
  4. * = Weighted Kappa used for ordinal data.
  5. # = Intraclass correlation (ICC) (Standard Deviation (SD)) for continuous data.
  6. ^ = Depth was determined from the UTWCS score.