condition mean min max ZT0-3 53.25 53.25 53.25 ZT4-7 35.0 35.0 35.0 ZT8-11 23.1 23.1 23.1 ZT12-15 40.4 40.4 40.4 ZT16-19 55.95 55.95 55.95 ZT20-23 73.95 73.95 73.95