condition mean min max ZT0-3 1.6488475 0.9819525 2.3157425 ZT4-7 2.2990325 2.2990325 2.2990325 ZT8-11 1.5373 1.5373 1.5373 ZT12-15 0 0 0 ZT16-19 2.47543 2.47543 2.47543 ZT20-23 2.300415 2.300415 2.300415