Export Item Analysis Table to Files (excel or text format) Including <br /> Tags

Overview

When users export Item Analysis Table to a file, the names of few columns have extract <br /> XHTML tags.

Steps to Reproduce

1. Login as an instructor
2. Go to any course
3. Go to any quiz with student attempts
4. Click on 'Reports'
5. Click on 'Item analysis'
6. Click on 'Download in Excel format' or 'Download to text format'

Expected Result

Column headers should be identical to the webpage.

What Actually Happens

A few headers include extract <br /> tags.

Also see attached screenshots