condition mean min max ZT0-3 3.96784 3.71747 4.21821 ZT4-7 6.49616 6.49616 6.49616 ZT8-11 9.17094 9.17094 9.17094 ZT12-15 0 0 0 ZT16-19 10.31355 10.31355 10.31355 ZT20-23 7.897985 7.897985 7.897985