condition mean min max ZT0-3 41.95 41.95 41.95 ZT4-7 73.6 73.6 73.6 ZT8-11 55.25 55.25 55.25 ZT12-15 54.95 54.95 54.95 ZT16-19 31.25 31.25 31.25 ZT20-23 17.3 17.3 17.3