condition mean min max ZT0-3 47.1861 45.5827 48.789500000000004 ZT4-7 36.626549999999995 36.626549999999995 36.626549999999995 ZT8-11 41.4978 41.4978 41.4978 ZT12-15 0 0 0 ZT16-19 63.7619 63.7619 63.7619 ZT20-23 55.12965 55.12965 55.12965