condition mean min max ZT0-3 48.43080123083333 48.039953675 48.821648786666664 ZT4-7 46.47276518666666 45.65140211 47.294128263333334 ZT8-11 49.832958355 48.00249705 51.66341966 ZT12-15 55.495803351666666 52.88771994333334 58.10388676 ZT16-19 52.28562493 51.25267925333333 53.31857060666667 ZT20-23 52.976258195 50.43703488 55.51548151