condition mean min max ZT0-3 298.446362 298.446362 298.446362 ZT4-7 160.2652825 160.2652825 160.2652825 ZT8-11 139.9488485 139.9488485 139.9488485 ZT12-15 165.8889355 165.8889355 165.8889355 ZT16-19 293.373518 293.373518 293.373518 ZT20-23 330.428128 330.428128 330.428128