condition mean min max ZT0-3 390.7 390.7 390.7 ZT4-7 58.2 58.2 58.2 ZT8-11 107.95 107.95 107.95 ZT12-15 243.60000000000002 243.60000000000002 243.60000000000002 ZT16-19 301.25 301.25 301.25 ZT20-23 281.4 281.4 281.4