condition mean min max ZT0-3 3.9404638333333333 1.2732065000000001 5.42158 ZT4-7 15.6688 15.6688 15.6688 ZT8-11 38.44665 38.44665 38.44665 ZT12-15 17.06185 11.8948 22.2289 ZT16-19 19.946199999999997 19.946199999999997 19.946199999999997 ZT20-23 9.542845 9.542845 9.542845