condition mean min max ZT0-3 0.6344861666666667 0.333635 0.8234490000000001 ZT4-7 0.28406149999999997 0.28406149999999997 0.28406149999999997 ZT8-11 0.366682 0.366682 0.366682 ZT12-15 0.86792625 0.8344685000000001 0.901384 ZT16-19 0.416754 0.416754 0.416754 ZT20-23 0.711657 0.711657 0.711657