condition mean min max ZT0-3 3009.4383333333335 2531.565 3511.91 ZT4-7 3603.6499999999996 3603.6499999999996 3603.6499999999996 ZT8-11 2934.29 2934.29 2934.29 ZT12-15 2464.585 2437.9750000000004 2491.1949999999997 ZT16-19 2863.08 2863.08 2863.08 ZT20-23 2511.92 2511.92 2511.92