Reliability and Validity of Mediterranean Colorectal Cancer Registry

Study Overview
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Brief Summary
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The study will examine the validity and reliability of the Mediterranean Colorectal Cancer Registry. Aspects of the analysis will cover parallel forms reliability, test-retest reliability, split half internal consistency and face validity of the Mediterranean Colorectal Cancer Registry.

Detailed Description
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Although central cancer registry programs have many benefits (the determination of national cancer incidences, strategic planning of health care systems etc.) data entry in such programs is often collected in restricted variables and physicians participating in the registration process may not be able to interact with each other during the management of their patients. For these reasons, a complete record in national general cancer registries can only be established retrospectively and the direct contribution to patient-specific diagnosis / treatment is limited. On the other hand, local registries have many advantages like easy integration of the data into the hospital electronic systems and multidisciplinary proactive enrollment. Thus, characteristics of ongoing colorectal cancer registries (Swedish, South Australian, Oregon, Lublin, Ontario etc.) reported previously in the English medical literature are reviewed and an electronic form is tabulated for the Mediterranean Colorectal Cancer Registry. This study will examine the validity and reliability of this registry. Aspects of the analysis will cover construct validity, content validity, parallel forms reliability, test-retest reliability, split half internal consistency and face validity.

Official Title
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Reliability and Validity of Mediterranean Colorectal Cancer Registry

Conditions
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Registries

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adult patients with colorectal cancer. Exclusion Criteria: Patients reluctant to participate in the study.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Colorectal cancer<br>Patients with colorectal cancer | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Construct validity of Mediterranean Colorectal Cancer Registry: answering multiple-choice items | Construct validity will be based on the combination of qualitative and statistical methods in order to develop representative and structured set of multiple-choice items for colorectal cancer registry. | 2 week | 
| Content validity of Mediterranean Colorectal Cancer Registry: answering multiple-choice items | Content validity will be based on the combination of qualitative and statistical methods in order to develop shortest-possible but well-matched set of multiple-choice items reflecting the subjects being assessed in the colorectal cancer registry. . | 2 week | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Parallel forms reliability of Mediterranean Colorectal Cancer Registry: answering multiple-choice items | Parallel forms reliability will be based on assessments analyzing the extent to which the items answered by different responders correlate with each other within their domain. It will be evaluated by correlation scores or positive predictive values according to the subject being assessed. | 2 week | 
| Test-retest reliability of Mediterranean Colorectal Cancer Registry: answering multiple-choice items | Test-retest reliability will be based on the reproducibility of the answers to multiple-choice items during a specific time period of stable condition. It will be evaluated by intraclass correlation coefficient or positive predictive values according to the subject being assessed. | 2 week | 
| Split half internal consistency of Mediterranean Colorectal Cancer Registry: answering multiple-choice items | Split half internal consistency will be based on the comparison of two sets of items inquirying the same subject. It will be evaluated by correlation scores or positive predictive values according to the subject being assessed. | 2 week | 
| Face validity of Mediterranean Colorectal Cancer Registry: binary scoring of items | Face validity will be based on the scores of respondents indicating their overall positive or negative impression after evaluating each item for every file they registered. | 2 week | 
| Face validity of Mediterranean Colorectal Cancer Registry: the major reason behind the negative response | For negative responses, respondents will provide further feedback whether the item was ambiguous, confusing, excessively short, excessively long or there was another reason for their negative impression. | 2 week |