condition mean min max ZT0-3 693.85 693.85 693.85 ZT4-7 621.9 621.9 621.9 ZT8-11 481.20000000000005 481.20000000000005 481.20000000000005 ZT12-15 584.35 584.35 584.35 ZT16-19 662.1500000000001 662.1500000000001 662.1500000000001 ZT20-23 805.3 805.3 805.3