condition mean min max ZT0-3 286.7 286.7 286.7 ZT4-7 521.3 521.3 521.3 ZT8-11 483.20000000000005 483.20000000000005 483.20000000000005 ZT12-15 460.05 460.05 460.05 ZT16-19 549.95 549.95 549.95 ZT20-23 440.45000000000005 440.45000000000005 440.45000000000005