condition mean min max ZT0-3 4182.691721 4182.691721 4182.691721 ZT4-7 4400.2577555 4400.2577555 4400.2577555 ZT8-11 4335.407725 4335.407725 4335.407725 ZT12-15 4360.0329105 4360.0329105 4360.0329105 ZT16-19 5354.6634715 5354.6634715 5354.6634715 ZT20-23 4493.7990645 4493.7990645 4493.7990645