condition mean min max ZT0-3 13.9825 13.12275 14.84225 ZT4-7 16.8624 16.8624 16.8624 ZT8-11 28.532849999999996 28.532849999999996 28.532849999999996 ZT12-15 0 0 0 ZT16-19 27.32365 27.32365 27.32365 ZT20-23 20.22505 20.22505 20.22505