condition mean min max ZT0-3 46.859833333333334 37.704499999999996 53.2387 ZT4-7 34.044799999999995 34.044799999999995 34.044799999999995 ZT8-11 47.67205 47.67205 47.67205 ZT12-15 63.3712 56.87115 69.87125 ZT16-19 55.140600000000006 55.140600000000006 55.140600000000006 ZT20-23 68.15825000000001 68.15825000000001 68.15825000000001