condition mean min max ZT0-3 2.65398 2.65398 2.65398 ZT4-7 1.8067065 1.8067065 1.8067065 ZT8-11 1.44933 1.44933 1.44933 ZT12-15 3.025975 3.025975 3.025975 ZT16-19 3.740435 3.740435 3.740435 ZT20-23 3.480085 3.480085 3.480085