condition mean min max ZT0-3 2.22834 2.058805 2.397875 ZT4-7 3.8576550000000003 3.8576550000000003 3.8576550000000003 ZT8-11 4.33111 4.33111 4.33111 ZT12-15 0 0 0 ZT16-19 3.38632 3.38632 3.38632 ZT20-23 3.477055 3.477055 3.477055