condition mean min max ZT0-3 654.9000000000001 654.9000000000001 654.9000000000001 ZT4-7 1381.6 1381.6 1381.6 ZT8-11 1807.4 1807.4 1807.4 ZT12-15 1755.8000000000002 1755.8000000000002 1755.8000000000002 ZT16-19 1411.4 1411.4 1411.4 ZT20-23 957.05 957.05 957.05