This is a list of the predefined Arezzo terms which represent information about the study or the current subject. You can use these terms anywhere in your Arezzo expressions and conditions. These terms are all available as buttons on the Study tab in the Expression Builder. See image
|
Expression |
Description |
|
person:clinicaltrialname |
The code of the current study. |
|
person:trialsite |
The site code of the current subject |
|
person:personid |
The integer identifier assigned to the current subject. The identifier is unique within the study and site. |
|
person:subjectidentifier |
The text identifier assigned to the current subject during registration. If your study does not use registration, this will always be blank. |
|
person:country |
The name of the country to which the current site belongs. The site's country is specified when a site is created in the System Management module. |
|
user:username |
The full name of the currently logged-on user. |
|
user:userrole |
The user role of the currently logged-on user. It is not suitable to use this expression in a "Collect if" condition, as the value will change as different users log on and open eForms which may result in fields becoming disabled and deleted. The best way of ensuring that questions can only be answered by users with specific roles is to add authorisation. |
1. If you want to disable certain eForms until a subject has been registered, you can use the condition
isknown( person:subjectidentifier )
as an internal trigger on the relevant eForms.
2. If you want to enable certain questions for certain sites only, you can use the current site in a question's Collect if condition. For example, setting the condition to be
person:trialsite = 'darwin'
would enable the question only at the site Darwin.
Similarly, you could disable an eForm for a particular site, using the following condition as an internal trigger
person:trialsite <> 'perth'
3. You can use person:trialsite and person:country as question derivation expressions to display the current site and country on an eForm.