condition mean min max ZT0-3 5388.043744 5388.043744 5388.043744 ZT4-7 8064.0636005 8064.0636005 8064.0636005 ZT8-11 5609.9777025 5609.9777025 5609.9777025 ZT12-15 6447.035899500001 6447.035899500001 6447.035899500001 ZT16-19 6900.7830460000005 6900.7830460000005 6900.7830460000005 ZT20-23 3799.5205185 3799.5205185 3799.5205185