condition mean min max ZT0-3 3.0468916666666668 2.188915 4.494255 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 7.076415 6.957155 7.195675 ZT16-19 0.0 0.0 0.0 ZT20-23 7.210570000000001 7.210570000000001 7.210570000000001