Conditional mutate depending on if value is higher/lower than total

Question

I have a table similar to this:

Area	Value	Lower Interval	Upper Interval
AreaA	2	1.2	2.4
AreaB	11	10.7	11.6
AreaC	30	15.2	16.6
Total	12	11.2	12.5

I am looking to add a mutate column at the end called 'Significance' which has 3 conditions:

'Lower' if the upper interval for each area is below the lower interval for the total 'Same' if the confidence intervals between the areas and the grand total overlaps and 'Higher' if the lower interval for each area is below the upper interval for the total.

So in this instance the end result would look like this:

Area	Value	Lower Interval	Upper Interval	Significance
AreaA	2	1.2	2.4	Lower
AreaB	11	10.7	11.6	Same
AreaC	30	15.2	16.6	Higher
Total	12	11.2	12.5	-

Could anyone please advise on how to take this forward?