condition mean min max ZT0-3 496.325357 496.325357 496.325357 ZT4-7 490.324905 490.324905 490.324905 ZT8-11 568.245611 568.245611 568.245611 ZT12-15 505.2226905 505.2226905 505.2226905 ZT16-19 576.5788405000001 576.5788405000001 576.5788405000001 ZT20-23 578.4436734999999 578.4436734999999 578.4436734999999