condition mean min max ZT0-3 47.977266658333335 43.55127866 52.40325465666667 ZT4-7 68.41133322666667 68.37202769333334 68.45063876 ZT8-11 65.21330985833333 60.64185937 69.78476034666667 ZT12-15 55.204735805 50.24023779 60.16923382 ZT16-19 64.57768157999999 64.47698190999999 64.67838125 ZT20-23 62.132039854999995 59.43622637 64.82785333999999