condition mean min max ZT0-3 279.609656 279.609656 279.609656 ZT4-7 379.4856345 379.4856345 379.4856345 ZT8-11 393.0919915 393.0919915 393.0919915 ZT12-15 388.774674 388.774674 388.774674 ZT16-19 330.178445 330.178445 330.178445 ZT20-23 302.6926615 302.6926615 302.6926615