condition mean min max ZT0-3 8.4592 8.4592 8.4592 ZT4-7 6.121345 6.121345 6.121345 ZT8-11 7.063034999999999 7.063034999999999 7.063034999999999 ZT12-15 6.64471 6.64471 6.64471 ZT16-19 10.83125 10.83125 10.83125 ZT20-23 8.648965 8.648965 8.648965