condition mean min max ZT0-3 267.941542 267.941542 267.941542 ZT4-7 887.1670710000001 887.1670710000001 887.1670710000001 ZT8-11 1138.887567 1138.887567 1138.887567 ZT12-15 1007.6443855 1007.6443855 1007.6443855 ZT16-19 421.85792050000003 421.85792050000003 421.85792050000003 ZT20-23 356.02953649999995 356.02953649999995 356.02953649999995