condition mean min max ZT0-3 617.3 617.3 617.3 ZT4-7 856.5 856.5 856.5 ZT8-11 674.1500000000001 674.1500000000001 674.1500000000001 ZT12-15 461.95 461.95 461.95 ZT16-19 407.2 407.2 407.2 ZT20-23 509.6 509.6 509.6