condition mean min max ZT0-3 9.187077500000001 8.679565 9.69459 ZT4-7 10.7146 10.7146 10.7146 ZT8-11 9.868224999999999 9.868224999999999 9.868224999999999 ZT12-15 0 0 0 ZT16-19 9.77265 9.77265 9.77265 ZT20-23 11.89115 11.89115 11.89115