Table 3 Items and assessment criteria of the content validity questionnaire

Diagnosis of the OC

1a. Is the OCI relevant to the diagnosis of the OC?

1

Not relevant

2

Relevant but

needs major revisions

3

Relevant but needs minor revisions

4

Very relevant

1b. Is the OCI clear to the diagnosis of the OC?

1

Not clear

2

Clear but needs major revisions

3

Clear but needs minor revisions

4

Very Clear

Side of the OC

2a. Is the OCI relevant with respect to detecting the side of the OC?

1

Not relevant

2

Relevant but needs major revisions

3

Relevant but needs minor revisions

4

Very relevant

2b. Is the OCI clear to detecting the side of the OC?

1

Not clear

2

Clear but needs major revisions

3

Clear but needs minor revisions

4

Very clear

Cut-off points of the scoring system

3a. Are the cut-off points of the scoring systems being relevant?

1

Not relevant

2

Relevant but needs major revisions

3

Relevant but needs minor revisions

4

Very relevant

3b. Are the cut-off points of the scoring systems clear?

1

Not clear

2

Clear but needs major revisions

3

Clear but needs minor revisions

4

Very clear

Communication

4a. Is the OCI relevant with respect to communication among practitioners and researchers?

1

Not relevant

2

Relevant but needs major revisions

3

Relevant but needs minor revisions

4

Very relevant

4b. Is the OCI relevant with respect to communication among practitioners and researchers?

1

Not clear

2

Clear but needs major revisions

3

Clear but needs minor revisions

4

Very clear

Foundation for future modifications

5a. Is the OCI as a foundation index relevant for any applicable future modification?

1

Not relevant

2

Relevant but needs major revisions

3

Relevant but needs minor revisions

4

Very relevant

5b. Is the OCI as a foundation index clear for any applicable future modification?

1

Not clear

2

Clear but needs major revisions

3

Clear but needs minor revisions

4

Very clear