condition mean min max ZT0-3 2459.140041 2459.140041 2459.140041 ZT4-7 3854.9930510000004 3854.9930510000004 3854.9930510000004 ZT8-11 6946.5261815 6946.5261815 6946.5261815 ZT12-15 5106.7938875 5106.7938875 5106.7938875 ZT16-19 8409.260383 8409.260383 8409.260383 ZT20-23 7927.0026895 7927.0026895 7927.0026895