condition mean min max ZT0-3 3834.8500000000004 3834.8500000000004 3834.8500000000004 ZT4-7 2447.7 2447.7 2447.7 ZT8-11 2520.9 2520.9 2520.9 ZT12-15 2540.45 2540.45 2540.45 ZT16-19 3246.5 3246.5 3246.5 ZT20-23 4038.2000000000003 4038.2000000000003 4038.2000000000003