condition mean min max ZT0-3 18.7308 17.4548 20.0068 ZT4-7 11.0234 11.0234 11.0234 ZT8-11 10.246625 10.246625 10.246625 ZT12-15 0 0 0 ZT16-19 14.197400000000002 14.197400000000002 14.197400000000002 ZT20-23 16.5886 16.5886 16.5886