condition mean min max ZT0-3 65.623907335 64.17531937 67.0724953 ZT4-7 79.340125345 74.39341443333333 84.28683625666667 ZT8-11 77.08263935833332 75.88784980333332 78.27742891333334 ZT12-15 76.48752183166667 67.17362529333333 85.80141837 ZT16-19 87.10053747166667 85.73338848 88.46768646333334 ZT20-23 88.80752022 87.0696613 90.54537914