condition mean min max ZT0-3 237.35000000000002 237.35000000000002 237.35000000000002 ZT4-7 267.9 267.9 267.9 ZT8-11 249.95 249.95 249.95 ZT12-15 269.04999999999995 269.04999999999995 269.04999999999995 ZT16-19 205.65 205.65 205.65 ZT20-23 174.85 174.85 174.85