condition mean min max ZT0-3 2.3050875 1.590635 3.01954 ZT4-7 5.310115 5.310115 5.310115 ZT8-11 8.841135000000001 8.841135000000001 8.841135000000001 ZT12-15 0 0 0 ZT16-19 2.31937 2.31937 2.31937 ZT20-23 2.35656 2.35656 2.35656