condition mean min max ZT0-3 331.057383 331.057383 331.057383 ZT4-7 257.13588749999997 257.13588749999997 257.13588749999997 ZT8-11 286.800142 286.800142 286.800142 ZT12-15 280.6976795 280.6976795 280.6976795 ZT16-19 461.9362145 461.9362145 461.9362145 ZT20-23 370.988635 370.988635 370.988635