condition mean min max ZT0-3 45.58395 45.58395 45.58395 ZT4-7 29.3273 29.3273 29.3273 ZT8-11 38.81365 38.81365 38.81365 ZT12-15 43.3084 43.3084 43.3084 ZT16-19 61.902550000000005 61.902550000000005 61.902550000000005 ZT20-23 49.558049999999994 49.558049999999994 49.558049999999994