condition mean min max ZT0-3 41.76188333333334 38.75645 44.49815 ZT4-7 18.1244 18.1244 18.1244 ZT8-11 20.1417 20.1417 20.1417 ZT12-15 20.89275 20.505200000000002 21.2803 ZT16-19 19.01095 19.01095 19.01095 ZT20-23 37.34325 37.34325 37.34325