condition mean min max ZT0-3 5.95712 3.79308 8.12116 ZT4-7 1.7411 1.7411 1.7411 ZT8-11 3.0317585 3.0317585 3.0317585 ZT12-15 0 0 0 ZT16-19 2.1044045 2.1044045 2.1044045 ZT20-23 2.95574 2.95574 2.95574