condition mean min max ZT0-3 22.8357 22.8357 22.8357 ZT4-7 20.015050000000002 20.015050000000002 20.015050000000002 ZT8-11 12.94895 12.94895 12.94895 ZT12-15 16.19725 16.19725 16.19725 ZT16-19 24.0833 24.0833 24.0833 ZT20-23 23.4458 23.4458 23.4458