condition mean min max ZT0-3 8.283314999999998 8.07889 8.487739999999999 ZT4-7 9.522755 9.522755 9.522755 ZT8-11 9.868585 9.868585 9.868585 ZT12-15 0 0 0 ZT16-19 12.35975 12.35975 12.35975 ZT20-23 7.90817 7.90817 7.90817