condition mean min max ZT0-3 4.604756666666667 2.86469 6.256539999999999 ZT4-7 4.025285 4.025285 4.025285 ZT8-11 4.2535 4.2535 4.2535 ZT12-15 5.6584525 4.93623 6.380675 ZT16-19 4.835115 4.835115 4.835115 ZT20-23 5.529985 5.529985 5.529985