condition mean min max ZT0-3 222.8 222.8 222.8 ZT4-7 356.5 356.5 356.5 ZT8-11 261.1 261.1 261.1 ZT12-15 233.9 233.9 233.9 ZT16-19 274.65 274.65 274.65 ZT20-23 247.35 247.35 247.35