condition mean min max ZT0-3 661.567096 661.567096 661.567096 ZT4-7 322.32140549999997 322.32140549999997 322.32140549999997 ZT8-11 367.789795 367.789795 367.789795 ZT12-15 532.1688975 532.1688975 532.1688975 ZT16-19 614.4323275 614.4323275 614.4323275 ZT20-23 782.412179 782.412179 782.412179