condition mean min max ZT0-3 3.249605 3.249605 3.249605 ZT4-7 1.825935 1.825935 1.825935 ZT8-11 69.51304999999999 69.51304999999999 69.51304999999999 ZT12-15 118.475 118.475 118.475 ZT16-19 119.5575 119.5575 119.5575 ZT20-23 24.7459 24.7459 24.7459