condition mean min max ZT0-3 2264.65 2264.65 2264.65 ZT4-7 2002.4 2002.4 2002.4 ZT8-11 2082.25 2082.25 2082.25 ZT12-15 1981.7 1981.7 1981.7 ZT16-19 1931.0500000000002 1931.0500000000002 1931.0500000000002 ZT20-23 1927.75 1927.75 1927.75