condition mean min max ZT0-3 782.492169 782.492169 782.492169 ZT4-7 670.8538289999999 670.8538289999999 670.8538289999999 ZT8-11 352.753801 352.753801 352.753801 ZT12-15 224.288726 224.288726 224.288726 ZT16-19 207.661193 207.661193 207.661193 ZT20-23 179.44280550000002 179.44280550000002 179.44280550000002