condition mean min max ZT0-3 20.911633333333334 13.287600000000001 25.43185 ZT4-7 9.280194999999999 9.280194999999999 9.280194999999999 ZT8-11 11.58585 11.58585 11.58585 ZT12-15 18.305799999999998 18.156 18.455599999999997 ZT16-19 20.34905 20.34905 20.34905 ZT20-23 34.9985 34.9985 34.9985