condition mean min max ZT0-3 206.341158 206.341158 206.341158 ZT4-7 227.0703795 227.0703795 227.0703795 ZT8-11 214.088346 214.088346 214.088346 ZT12-15 227.8807425 227.8807425 227.8807425 ZT16-19 224.0047185 224.0047185 224.0047185 ZT20-23 303.0549595 303.0549595 303.0549595