condition mean min max ZT0-3 1.3475074999999999 1.290525 1.40449 ZT4-7 0.9407945 0.9407945 0.9407945 ZT8-11 0.5841755 0.5841755 0.5841755 ZT12-15 0 0 0 ZT16-19 0.951999 0.951999 0.951999 ZT20-23 1.0508575 1.0508575 1.0508575