condition mean min max ZT0-3 24.104075 21.85505 26.3531 ZT4-7 37.237849999999995 37.237849999999995 37.237849999999995 ZT8-11 72.96515 72.96515 72.96515 ZT12-15 0 0 0 ZT16-19 56.295550000000006 56.295550000000006 56.295550000000006 ZT20-23 34.4696 34.4696 34.4696