condition mean min max ZT0-3 2.4280625 1.98471 2.871415 ZT4-7 2.48488 2.48488 2.48488 ZT8-11 2.19961 2.19961 2.19961 ZT12-15 0 0 0 ZT16-19 3.19634 3.19634 3.19634 ZT20-23 2.612755 2.612755 2.612755