condition mean min max ZT0-3 246.45 246.45 246.45 ZT4-7 199.4 199.4 199.4 ZT8-11 168.75 168.75 168.75 ZT12-15 191.6 191.6 191.6 ZT16-19 239.95 239.95 239.95 ZT20-23 314.6 314.6 314.6