condition mean min max ZT0-3 396.439228 396.439228 396.439228 ZT4-7 379.445385 379.445385 379.445385 ZT8-11 499.534335 499.534335 499.534335 ZT12-15 425.55037649999997 425.55037649999997 425.55037649999997 ZT16-19 471.68368 471.68368 471.68368 ZT20-23 308.3207335 308.3207335 308.3207335