condition mean min max ZT0-3 327.95 327.95 327.95 ZT4-7 258.0 258.0 258.0 ZT8-11 220.7 220.7 220.7 ZT12-15 248.35 248.35 248.35 ZT16-19 281.3 281.3 281.3 ZT20-23 312.3 312.3 312.3