condition mean min max ZT0-3 141.963502 141.963502 141.963502 ZT4-7 140.0912855 140.0912855 140.0912855 ZT8-11 161.388031 161.388031 161.388031 ZT12-15 141.69428299999998 141.69428299999998 141.69428299999998 ZT16-19 172.6359595 172.6359595 172.6359595 ZT20-23 177.6752135 177.6752135 177.6752135