condition mean min max ZT0-3 10.093250000000001 10.093250000000001 10.093250000000001 ZT4-7 6.3766300000000005 6.3766300000000005 6.3766300000000005 ZT8-11 6.71937 6.71937 6.71937 ZT12-15 7.04971 7.04971 7.04971 ZT16-19 10.41855 10.41855 10.41855 ZT20-23 9.96529 9.96529 9.96529