condition mean min max ZT0-3 4.17256 4.17256 4.17256 ZT4-7 3.4318799999999996 3.4318799999999996 3.4318799999999996 ZT8-11 4.62749 4.62749 4.62749 ZT12-15 5.353885 5.353885 5.353885 ZT16-19 6.860745 6.860745 6.860745 ZT20-23 3.6760099999999998 3.6760099999999998 3.6760099999999998