condition mean min max ZT0-3 548.774886 548.774886 548.774886 ZT4-7 491.9701205 491.9701205 491.9701205 ZT8-11 315.8140155 315.8140155 315.8140155 ZT12-15 320.590157 320.590157 320.590157 ZT16-19 327.0003155 327.0003155 327.0003155 ZT20-23 356.0012875 356.0012875 356.0012875