condition mean min max ZT0-3 76.7 76.7 76.7 ZT4-7 8.5 8.5 8.5 ZT8-11 51.1 51.1 51.1 ZT12-15 10.45 10.45 10.45 ZT16-19 26.099999999999998 26.099999999999998 26.099999999999998 ZT20-23 40.199999999999996 40.199999999999996 40.199999999999996