condition mean min max ZT0-3 244.27249999999998 213.731 274.81399999999996 ZT4-7 160.1345 160.1345 160.1345 ZT8-11 334.20450000000005 334.20450000000005 334.20450000000005 ZT12-15 0 0 0 ZT16-19 428.955 428.955 428.955 ZT20-23 307.1615 307.1615 307.1615