condition mean min max ZT0-3 183.35 183.35 183.35 ZT4-7 79.0 79.0 79.0 ZT8-11 95.15 95.15 95.15 ZT12-15 110.0 110.0 110.0 ZT16-19 137.8 137.8 137.8 ZT20-23 191.0 191.0 191.0