condition mean min max ZT0-3 308.95000000000005 308.95000000000005 308.95000000000005 ZT4-7 187.8 187.8 187.8 ZT8-11 207.35 207.35 207.35 ZT12-15 168.05 168.05 168.05 ZT16-19 185.6 185.6 185.6 ZT20-23 276.65 276.65 276.65