condition mean min max ZT0-3 3.4852250000000002 2.68119 4.781715 ZT4-7 4.89 4.89 4.89 ZT8-11 5.19184 5.19184 5.19184 ZT12-15 7.252295 6.94725 7.55734 ZT16-19 4.808859999999999 4.808859999999999 4.808859999999999 ZT20-23 4.53092 4.53092 4.53092