condition mean min max ZT0-3 63.876466666666666 39.9543 78.13715 ZT4-7 20.24425 20.24425 20.24425 ZT8-11 11.381715 11.381715 11.381715 ZT12-15 19.055374999999998 16.885749999999998 21.225 ZT16-19 16.162 16.162 16.162 ZT20-23 37.55255 37.55255 37.55255