condition mean min max ZT0-3 31.0 31.0 31.0 ZT4-7 40.0 40.0 40.0 ZT8-11 51.199999999999996 51.199999999999996 51.199999999999996 ZT12-15 39.0 39.0 39.0 ZT16-19 21.75 21.75 21.75 ZT20-23 17.8 17.8 17.8