condition mean min max ZT0-3 61.510495 61.510495 61.510495 ZT4-7 75.67949250000001 75.67949250000001 75.67949250000001 ZT8-11 71.5669575 71.5669575 71.5669575 ZT12-15 74.10763700000001 74.10763700000001 74.10763700000001 ZT16-19 84.72734750000001 84.72734750000001 84.72734750000001 ZT20-23 96.561757 96.561757 96.561757