condition mean min max ZT0-3 1.728769 1.728769 1.728769 ZT4-7 0.880305 0.880305 0.880305 ZT8-11 2.835625 2.835625 2.835625 ZT12-15 1.453668 1.453668 1.453668 ZT16-19 1.497379 1.497379 1.497379 ZT20-23 1.2077200000000001 1.2077200000000001 1.2077200000000001