condition mean min max ZT0-3 281.4 281.4 281.4 ZT4-7 259.1 259.1 259.1 ZT8-11 240.35 240.35 240.35 ZT12-15 261.05 261.05 261.05 ZT16-19 300.1 300.1 300.1 ZT20-23 314.6 314.6 314.6