condition mean min max ZT0-3 11.651254999999999 11.651254999999999 11.651254999999999 ZT4-7 14.849150000000002 14.849150000000002 14.849150000000002 ZT8-11 12.426714999999998 12.426714999999998 12.426714999999998 ZT12-15 8.79646 8.79646 8.79646 ZT16-19 18.54085 18.54085 18.54085 ZT20-23 14.39965 14.39965 14.39965