condition mean min max ZT0-3 3.25084 3.22834 3.27334 ZT4-7 7.06879 7.06879 7.06879 ZT8-11 10.84995 10.84995 10.84995 ZT12-15 0 0 0 ZT16-19 6.51612 6.51612 6.51612 ZT20-23 5.265475 5.265475 5.265475