condition mean min max ZT0-3 0.68464425 0.523326 0.8459625 ZT4-7 1.67434 1.67434 1.67434 ZT8-11 0.5280335 0.5280335 0.5280335 ZT12-15 0 0 0 ZT16-19 1.310683 1.310683 1.310683 ZT20-23 2.069565 2.069565 2.069565