condition mean min max ZT0-3 2.3541575405 2.318485325 2.389829756 ZT4-7 2.4002175587499996 2.1728742155 2.627560902 ZT8-11 2.7728604265 2.5464110079999998 2.999309845 ZT12-15 2.88684691975 2.529686946 3.2440068935000004 ZT16-19 2.91833350525 2.6183748935000004 3.218292117 ZT20-23 4.458276459 4.073676127 4.842876791