condition mean min max ZT0-3 5.0280450000000005 4.698930000000001 5.35716 ZT4-7 12.30375 12.30375 12.30375 ZT8-11 15.8916 15.8916 15.8916 ZT12-15 0 0 0 ZT16-19 10.656749999999999 10.656749999999999 10.656749999999999 ZT20-23 8.9394 8.9394 8.9394