condition mean min max ZT0-3 2371.8999999999996 2371.8999999999996 2371.8999999999996 ZT4-7 2393.7 2393.7 2393.7 ZT8-11 2487.45 2487.45 2487.45 ZT12-15 2134.9 2134.9 2134.9 ZT16-19 1946.2 1946.2 1946.2 ZT20-23 2315.5 2315.5 2315.5