condition mean min max ZT0-3 77.1 77.1 77.1 ZT4-7 41.7 41.7 41.7 ZT8-11 57.95 57.95 57.95 ZT12-15 41.25 41.25 41.25 ZT16-19 10.25 10.25 10.25 ZT20-23 43.05 43.05 43.05