condition mean min max ZT0-3 650.502729 650.502729 650.502729 ZT4-7 2399.367773 2399.367773 2399.367773 ZT8-11 2307.0203915 2307.0203915 2307.0203915 ZT12-15 609.528969 609.528969 609.528969 ZT16-19 661.556266 661.556266 661.556266 ZT20-23 612.8852255 612.8852255 612.8852255