condition mean min max ZT0-3 39.23496 39.23496 39.23496 ZT4-7 44.4474865 44.4474865 44.4474865 ZT8-11 45.178675999999996 45.178675999999996 45.178675999999996 ZT12-15 41.7890745 41.7890745 41.7890745 ZT16-19 44.9680785 44.9680785 44.9680785 ZT20-23 40.4435915 40.4435915 40.4435915