condition mean min max ZT0-3 10.564096666666666 9.848035 11.393 ZT4-7 9.350124999999998 9.350124999999998 9.350124999999998 ZT8-11 9.689425 9.689425 9.689425 ZT12-15 10.244507500000001 9.763815000000001 10.725200000000001 ZT16-19 12.203949999999999 12.203949999999999 12.203949999999999 ZT20-23 12.9975 12.9975 12.9975