condition mean min max ZT0-3 34.283550000000005 34.283550000000005 34.283550000000005 ZT4-7 16.538899999999998 16.538899999999998 16.538899999999998 ZT8-11 13.596350000000001 13.596350000000001 13.596350000000001 ZT12-15 23.618899999999996 23.618899999999996 23.618899999999996 ZT16-19 32.6703 32.6703 32.6703 ZT20-23 49.6284 49.6284 49.6284