condition mean min max ZT0-3 392.80898 392.80898 392.80898 ZT4-7 271.267069 271.267069 271.267069 ZT8-11 264.7243975 264.7243975 264.7243975 ZT12-15 318.4869665 318.4869665 318.4869665 ZT16-19 415.63057449999997 415.63057449999997 415.63057449999997 ZT20-23 398.021094 398.021094 398.021094