condition mean min max ZT0-3 5.929068333333333 3.6426499999999997 9.782885 ZT4-7 5.40063 5.40063 5.40063 ZT8-11 6.41038 6.41038 6.41038 ZT12-15 6.783025 4.8767700000000005 8.68928 ZT16-19 3.301955 3.301955 3.301955 ZT20-23 2.2521199999999997 2.2521199999999997 2.2521199999999997