condition mean min max ZT0-3 1618.6 1618.6 1618.6 ZT4-7 2238.1 2238.1 2238.1 ZT8-11 2410.3999999999996 2410.3999999999996 2410.3999999999996 ZT12-15 2113.55 2113.55 2113.55 ZT16-19 1978.1 1978.1 1978.1 ZT20-23 1655.0 1655.0 1655.0