condition mean min max ZT0-3 21.35 21.35 21.35 ZT4-7 22.8 22.8 22.8 ZT8-11 17.4 17.4 17.4 ZT12-15 14.850000000000001 14.850000000000001 14.850000000000001 ZT16-19 30.35 30.35 30.35 ZT20-23 5.199999999999999 5.199999999999999 5.199999999999999