condition mean min max ZT0-3 12.007625 9.36265 14.6526 ZT4-7 2.23151 2.23151 2.23151 ZT8-11 0.9521605 0.9521605 0.9521605 ZT12-15 0 0 0 ZT16-19 5.563345 5.563345 5.563345 ZT20-23 7.091654999999999 7.091654999999999 7.091654999999999