condition mean min max ZT0-3 26.5333513125 23.729431849999997 29.337270775 ZT4-7 25.977554945 22.69819347 29.25691642 ZT8-11 35.646584835 30.095079039999998 41.198090629999996 ZT12-15 39.42789880833333 31.670530033333332 47.185267583333335 ZT16-19 60.55742063333334 60.394118909999996 60.72072235666667 ZT20-23 45.227416975 39.954909093333335 50.49992485666667