condition mean min max ZT0-3 213.85 213.85 213.85 ZT4-7 270.1 270.1 270.1 ZT8-11 308.45 308.45 308.45 ZT12-15 281.05 281.05 281.05 ZT16-19 211.79999999999998 211.79999999999998 211.79999999999998 ZT20-23 239.25 239.25 239.25