You could use a compound field coded as:
{=({MERGEFIELD Data}<90)+({MERGEFIELD Data}>110) \# "'{MERGEFIELD Data \#
0}';;'{MERGEFIELD Data}'"}
or
{=(«Data»<90)+(«Data»>110) \# "'{MERGEFIELD Data \#
0}';;'«Data»'"}
Note the underlined 0.
Note: The field brace pairs (i.e. '{ }') for the above examples are all created in the document itself, via Ctrl-F9 (Cmd-F9 on a Mac or, if you’re using a laptop, you might need to use Ctrl-Fn-F9); you can't simply type them or copy & paste them from this message. Nor is it practical to add them via any of the standard Word dialogues. Likewise, the chevrons (i.e. '« »') are part of the actual mergefields - which you can insert from the 'Insert Merge Field' dropdown (i.e. you can't type or copy & paste them from this message, either). The spaces represented in the field constructions are all required.
For a macro to convert the above field code representation into a working field code, see
Convert Text Representations of Fields to Working Fields in the
Mailmerge Tips and Tricks 'Sticky' thread at the top of this forum:
https://www.msofficeforums.com/mail-...ps-tricks.html