condition mean min max ZT0-3 41.897305 41.897305 41.897305 ZT4-7 51.912033 51.912033 51.912033 ZT8-11 55.908688999999995 55.908688999999995 55.908688999999995 ZT12-15 105.514591 105.514591 105.514591 ZT16-19 50.531667999999996 50.531667999999996 50.531667999999996 ZT20-23 94.9625285 94.9625285 94.9625285