condition mean min max ZT0-3 1284.748085 1284.748085 1284.748085 ZT4-7 1568.3984355 1568.3984355 1568.3984355 ZT8-11 1055.0006715 1055.0006715 1055.0006715 ZT12-15 1078.4954785 1078.4954785 1078.4954785 ZT16-19 663.5358125 663.5358125 663.5358125 ZT20-23 382.92436399999997 382.92436399999997 382.92436399999997