condition mean min max ZT0-3 10.343026 10.343026 10.343026 ZT4-7 10.960925 10.960925 10.960925 ZT8-11 10.5695805 10.5695805 10.5695805 ZT12-15 9.887798 9.887798 9.887798 ZT16-19 8.836890499999999 8.836890499999999 8.836890499999999 ZT20-23 10.332305999999999 10.332305999999999 10.332305999999999