condition mean min max ZT0-3 10.7457 10.7457 10.7457 ZT4-7 8.578365 8.578365 8.578365 ZT8-11 7.38766 7.38766 7.38766 ZT12-15 8.292745 8.292745 8.292745 ZT16-19 10.9703 10.9703 10.9703 ZT20-23 9.788264999999999 9.788264999999999 9.788264999999999