condition mean min max ZT0-3 3.43892 2.9105 3.96734 ZT4-7 2.364735 2.364735 2.364735 ZT8-11 1.241795 1.241795 1.241795 ZT12-15 0 0 0 ZT16-19 2.98294 2.98294 2.98294 ZT20-23 4.710515 4.710515 4.710515