condition mean min max ZT0-3 8.500395000000001 8.500395000000001 8.500395000000001 ZT4-7 6.747529999999999 6.747529999999999 6.747529999999999 ZT8-11 5.86805 5.86805 5.86805 ZT12-15 7.03958 7.03958 7.03958 ZT16-19 10.219255 10.219255 10.219255 ZT20-23 7.950150000000001 7.950150000000001 7.950150000000001