condition mean min max ZT0-3 9.5100526065 6.987817043 12.03228817 ZT4-7 10.187702976250002 6.643169862500001 13.73223609 ZT8-11 32.5143719625 21.227451185 43.80129274 ZT12-15 63.991285770000005 62.52393208 65.45863946 ZT16-19 50.9132897 48.310982824999996 53.515596575000004 ZT20-23 61.825875877499996 57.63621816 66.015533595