condition mean min max ZT0-3 29.887649999999997 17.0168 39.56155 ZT4-7 20.42335 20.42335 20.42335 ZT8-11 17.56205 17.56205 17.56205 ZT12-15 18.995649999999998 15.725999999999999 22.2653 ZT16-19 27.602800000000002 27.602800000000002 27.602800000000002 ZT20-23 40.57195 40.57195 40.57195