condition mean min max ZT0-3 1.0546155 1.0546155 1.0546155 ZT4-7 0.8253364999999999 0.8253364999999999 0.8253364999999999 ZT8-11 0.673441 0.673441 0.673441 ZT12-15 0.854139 0.854139 0.854139 ZT16-19 1.1124100000000001 1.1124100000000001 1.1124100000000001 ZT20-23 1.332675 1.332675 1.332675