condition mean min max ZT0-3 35.407066666666665 21.39535 45.0125 ZT4-7 13.17135 13.17135 13.17135 ZT8-11 10.799805 10.799805 10.799805 ZT12-15 16.918775 16.700850000000003 17.136699999999998 ZT16-19 25.201999999999998 25.201999999999998 25.201999999999998 ZT20-23 38.1506 38.1506 38.1506