condition mean min max ZT0-3 8.187145000000001 8.187145000000001 8.187145000000001 ZT4-7 5.05762 5.05762 5.05762 ZT8-11 5.494255 5.494255 5.494255 ZT12-15 7.579525 7.579525 7.579525 ZT16-19 7.9636700000000005 7.9636700000000005 7.9636700000000005 ZT20-23 8.04685 8.04685 8.04685