condition mean min max ZT0-3 15.4258 15.4258 15.4258 ZT4-7 11.786549999999998 11.786549999999998 11.786549999999998 ZT8-11 9.296985 9.296985 9.296985 ZT12-15 11.738150000000001 11.738150000000001 11.738150000000001 ZT16-19 18.681449999999998 18.681449999999998 18.681449999999998 ZT20-23 17.4151 17.4151 17.4151