condition mean min max ZT0-3 2.628915 2.628915 2.628915 ZT4-7 1.407888 1.407888 1.407888 ZT8-11 1.39963 1.39963 1.39963 ZT12-15 1.2232265 1.2232265 1.2232265 ZT16-19 3.40583 3.40583 3.40583 ZT20-23 1.0360065 1.0360065 1.0360065