condition mean min max ZT0-3 131.079525 121.00205 141.15699999999998 ZT4-7 69.5269 69.5269 69.5269 ZT8-11 41.676950000000005 41.676950000000005 41.676950000000005 ZT12-15 0 0 0 ZT16-19 59.147949999999994 59.147949999999994 59.147949999999994 ZT20-23 76.29419999999999 76.29419999999999 76.29419999999999