condition mean min max ZT0-3 10.78581 7.12853 14.062149999999999 ZT4-7 4.7219549999999995 4.7219549999999995 4.7219549999999995 ZT8-11 4.886340000000001 4.886340000000001 4.886340000000001 ZT12-15 46.219375 14.60405 77.8347 ZT16-19 44.84805 44.84805 44.84805 ZT20-23 34.38375 34.38375 34.38375