condition mean min max ZT0-3 2384.604592 2384.604592 2384.604592 ZT4-7 2396.7675615 2396.7675615 2396.7675615 ZT8-11 964.6610575 964.6610575 964.6610575 ZT12-15 1018.5350484999999 1018.5350484999999 1018.5350484999999 ZT16-19 1260.092145 1260.092145 1260.092145 ZT20-23 2021.7397730000002 2021.7397730000002 2021.7397730000002