condition mean min max ZT0-3 47.536249999999995 41.2665 53.806 ZT4-7 20.1721 20.1721 20.1721 ZT8-11 16.53425 16.53425 16.53425 ZT12-15 0 0 0 ZT16-19 28.323099999999997 28.323099999999997 28.323099999999997 ZT20-23 34.49875 34.49875 34.49875