condition mean min max ZT0-3 161.406452 161.406452 161.406452 ZT4-7 137.963325 137.963325 137.963325 ZT8-11 151.2717 151.2717 151.2717 ZT12-15 190.21894600000002 190.21894600000002 190.21894600000002 ZT16-19 106.782934 106.782934 106.782934 ZT20-23 156.0992915 156.0992915 156.0992915