condition mean min max ZT0-3 23.328966666666666 19.0152 25.61315 ZT4-7 13.437650000000001 13.437650000000001 13.437650000000001 ZT8-11 18.8453 18.8453 18.8453 ZT12-15 26.438525 23.251199999999997 29.62585 ZT16-19 25.36575 25.36575 25.36575 ZT20-23 31.904149999999998 31.904149999999998 31.904149999999998