condition mean min max ZT0-3 2.7230749999999997 2.7230749999999997 2.7230749999999997 ZT4-7 2.48557 2.48557 2.48557 ZT8-11 4.7183399999999995 4.7183399999999995 4.7183399999999995 ZT12-15 5.46049 5.46049 5.46049 ZT16-19 5.61405 5.61405 5.61405 ZT20-23 2.69313 2.69313 2.69313