Yes-No-type Questions
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This article is an attempt to make Clinical Data Definitions with a yes-no type response consistent. There are several possibilities, and in some cases the terminology may encourage one approach over another.
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[edit] General question in code
The code field would contain a general question, and concept itself would be the value. For example, a code might suggest "Tell us about your smoking habits" with a value selected from "Never smoked," "I currently smoke," and "I am a former smoker."
[edit] Specific question in code, three coded choices in value
The code field contains the specific question: "Have you ever smoked?" The value consists of a choice of a code representing yes, a code representing no, and a code representing "don't know."
[edit] Specific question in code, boolean value
The code field contains the specific question: "Have you ever smoked?" The value is a boolean, true-false. In addition, the HL7-defined Null flavor can be used to indicate a number of standardized exceptional answers: answer unknown, masked (for privacy reasons), etc., as appropriate for the Clinical Data Definition.
[edit] Recommendation
Whenever possible, boolean-style questions are the most flexible and unambiguous. Technically, a boolean is unambiguous. This type of question has the best possibility for reuse in different settings.
