condition mean min max ZT0-3 25.82145 23.86005 27.78285 ZT4-7 21.5991 21.5991 21.5991 ZT8-11 24.136000000000003 24.136000000000003 24.136000000000003 ZT12-15 0 0 0 ZT16-19 32.960499999999996 32.960499999999996 32.960499999999996 ZT20-23 31.7788 31.7788 31.7788