condition mean min max ZT0-3 20.148463545 15.187313099999999 25.10961399 ZT4-7 31.049829875 28.393597785 33.706061965 ZT8-11 36.8642530375 31.5729025 42.155603575 ZT12-15 42.92539458 42.39448354 43.45630562 ZT16-19 39.146455880000005 39.001362955000005 39.291548805000005 ZT20-23 40.523383929999994 38.394167534999994 42.652600325