condition mean min max ZT0-3 19.226300000000002 19.226300000000002 19.226300000000002 ZT4-7 17.348399999999998 17.348399999999998 17.348399999999998 ZT8-11 11.573550000000001 11.573550000000001 11.573550000000001 ZT12-15 10.50131 10.50131 10.50131 ZT16-19 12.014 12.014 12.014 ZT20-23 13.741700000000002 13.741700000000002 13.741700000000002