condition mean min max ZT0-3 239.5 239.5 239.5 ZT4-7 83.7 83.7 83.7 ZT8-11 60.0 60.0 60.0 ZT12-15 98.9 98.9 98.9 ZT16-19 167.5 167.5 167.5 ZT20-23 214.7 214.7 214.7