condition mean min max ZT0-3 0.244589 0.244589 0.244589 ZT4-7 0.02169675 0.02169675 0.02169675 ZT8-11 0.04708605 0.04708605 0.04708605 ZT12-15 2.8829000000000002 2.8829000000000002 2.8829000000000002 ZT16-19 8.585795000000001 8.585795000000001 8.585795000000001 ZT20-23 0.925664 0.925664 0.925664