condition mean min max ZT0-3 1.6829025 1.23205 2.133755 ZT4-7 2.31581 2.31581 2.31581 ZT8-11 2.24686 2.24686 2.24686 ZT12-15 0 0 0 ZT16-19 1.614935 1.614935 1.614935 ZT20-23 2.39778 2.39778 2.39778