condition mean min max ZT0-3 11.354467499999998 9.449684999999999 13.25925 ZT4-7 7.6940550000000005 7.6940550000000005 7.6940550000000005 ZT8-11 7.0852900000000005 7.0852900000000005 7.0852900000000005 ZT12-15 0 0 0 ZT16-19 7.85535 7.85535 7.85535 ZT20-23 8.181785 8.181785 8.181785