condition mean min max ZT0-3 9.64693 9.64693 9.64693 ZT4-7 7.696954999999999 7.696954999999999 7.696954999999999 ZT8-11 7.06127 7.06127 7.06127 ZT12-15 8.13163 8.13163 8.13163 ZT16-19 9.36135 9.36135 9.36135 ZT20-23 9.44069 9.44069 9.44069