condition mean min max ZT0-3 9.998816666666666 6.77158 12.7226 ZT4-7 10.81495 10.81495 10.81495 ZT8-11 16.4953 16.4953 16.4953 ZT12-15 26.821125 26.785249999999998 26.857 ZT16-19 19.6523 19.6523 19.6523 ZT20-23 12.71791 12.71791 12.71791