condition mean min max ZT0-3 970.742153 970.742153 970.742153 ZT4-7 575.1093565 575.1093565 575.1093565 ZT8-11 533.7858679999999 533.7858679999999 533.7858679999999 ZT12-15 687.9883655000001 687.9883655000001 687.9883655000001 ZT16-19 877.219388 877.219388 877.219388 ZT20-23 930.4658865 930.4658865 930.4658865