condition mean min max ZT0-3 995.514451 995.514451 995.514451 ZT4-7 809.86303 809.86303 809.86303 ZT8-11 1344.695725 1344.695725 1344.695725 ZT12-15 1536.50373 1536.50373 1536.50373 ZT16-19 1600.082979 1600.082979 1600.082979 ZT20-23 741.8537180000001 741.8537180000001 741.8537180000001