condition mean min max ZT0-3 1.8700899999999998 1.8700899999999998 1.8700899999999998 ZT4-7 0.6406305 0.6406305 0.6406305 ZT8-11 0.607765 0.607765 0.607765 ZT12-15 0.752996 0.752996 0.752996 ZT16-19 1.43492 1.43492 1.43492 ZT20-23 1.42395 1.42395 1.42395