condition mean min max ZT0-3 7.6256075 7.05705 8.194165 ZT4-7 9.53333 9.53333 9.53333 ZT8-11 15.574749999999998 15.574749999999998 15.574749999999998 ZT12-15 0 0 0 ZT16-19 13.577449999999999 13.577449999999999 13.577449999999999 ZT20-23 11.2286 11.2286 11.2286