condition mean min max ZT0-3 131.57226666666668 79.32675 232.8775 ZT4-7 311.9615 311.9615 311.9615 ZT8-11 386.9085 386.9085 386.9085 ZT12-15 246.40775000000002 214.162 278.6535 ZT16-19 143.615 143.615 143.615 ZT20-23 60.027550000000005 60.027550000000005 60.027550000000005