condition mean min max ZT0-3 6.4865125 5.2593 7.713725 ZT4-7 3.499715 3.499715 3.499715 ZT8-11 3.406835 3.406835 3.406835 ZT12-15 0 0 0 ZT16-19 5.19398 5.19398 5.19398 ZT20-23 5.799325 5.799325 5.799325