condition mean min max ZT0-3 524.601218 524.601218 524.601218 ZT4-7 512.4659345 512.4659345 512.4659345 ZT8-11 627.812 627.812 627.812 ZT12-15 631.8988475 631.8988475 631.8988475 ZT16-19 604.3787815000001 604.3787815000001 604.3787815000001 ZT20-23 604.041577 604.041577 604.041577