condition mean min max ZT0-3 31.86065 31.86065 31.86065 ZT4-7 52.513149999999996 52.513149999999996 52.513149999999996 ZT8-11 15.0002 15.0002 15.0002 ZT12-15 6.3864350000000005 6.3864350000000005 6.3864350000000005 ZT16-19 6.26975 6.26975 6.26975 ZT20-23 13.380600000000001 13.380600000000001 13.380600000000001