condition mean min max ZT0-3 4.436803333333334 4.436803333333334 4.436803333333334 ZT4-7 4.533939999999999 4.533939999999999 4.533939999999999 ZT8-11 3.8873800000000003 3.8873800000000003 3.8873800000000003 ZT12-15 3.65093 3.65093 3.65093 ZT16-19 5.48102 5.48102 5.48102 ZT20-23 4.83971 4.83971 4.83971