- Not available on that edition (the reason is in the tooltip)
- Depends on the setting, your class or another addon (details in the tooltip)
What it does
Checks the lowest, average or highest health among party or raid members within the distance you set of the unit specified, compared with the number you set. A negative number compares their missing health instead.
Why you might use it
Take the minimum, average or maximum raw health of party or raid members within a distance of a unit, and compare it; a negative value compares missing health instead. Minimum finds an emergency, for example a Paladin's Lay on Hands when someone nearby is below a fixed amount, and average describes the whole group. Raw numbers depend on gear, so Health Percentage Within Range usually works better. Not available on Retail or Forever, where the game hides health values from addons.
Example
The lowest health of Party members within 40 yards of you is less than 3000
Settings
What each setting in the condition editor means, from the game's own help.
Unit - The unit this condition uses as the target of comparison.
Operation - Mathematical operation to perform
Minimum - The lowest value
Average - The value that is the sum of all values divided by the number of values
Maximum - The highest value
Operator - How to compare Health Within Range with the Health value. This comparison uses basic mathematical comparison operations.
Health - The health value the Operation result is compared with: the lowest, average or highest health of the allies counted. If this number is negative, it compares their health deficit (from max health) instead.
Distance - The distance (in yards) allies are measured against.
Same Group - Only count units in the same raid group.
Include Pets - Include pets in the count.
Uses readable positions in the same instance, or player-centered range estimates when positions are unavailable. A unit counts only when its upper range bound is within Distance. Uncertain positions, range, subgroup membership or required health/mana values keep the whole condition unavailable, including under Unless. Percentage checks require a positive maximum; empty aggregates have no result.