condition mean min max ZT0-3 45.6 45.6 45.6 ZT4-7 174.1 174.1 174.1 ZT8-11 320.95 320.95 320.95 ZT12-15 176.65 176.65 176.65 ZT16-19 32.1 32.1 32.1 ZT20-23 89.25 89.25 89.25