condition mean min max ZT0-3 8.0776675 6.908995 9.24634 ZT4-7 32.15355 32.15355 32.15355 ZT8-11 17.83705 17.83705 17.83705 ZT12-15 0 0 0 ZT16-19 16.52185 16.52185 16.52185 ZT20-23 16.5477 16.5477 16.5477