condition mean min max ZT0-3 0.17872923333333335 0.08349899999999999 0.286453 ZT4-7 0.5739995 0.5739995 0.5739995 ZT8-11 0.323948 0.323948 0.323948 ZT12-15 0.316952 0.25032 0.38358400000000004 ZT16-19 0.48765499999999995 0.48765499999999995 0.48765499999999995 ZT20-23 0.4120885 0.4120885 0.4120885