condition mean min max ZT0-3 16.887616666666666 15.68055 18.3659 ZT4-7 185.179 185.179 185.179 ZT8-11 716.2075 716.2075 716.2075 ZT12-15 109.952875 74.12075 145.78500000000003 ZT16-19 29.96045 29.96045 29.96045 ZT20-23 15.70425 15.70425 15.70425