condition mean min max ZT0-3 366.6 366.6 366.6 ZT4-7 170.0 170.0 170.0 ZT8-11 201.89999999999998 201.89999999999998 201.89999999999998 ZT12-15 252.35 252.35 252.35 ZT16-19 271.3 271.3 271.3 ZT20-23 307.95000000000005 307.95000000000005 307.95000000000005