condition mean min max ZT0-3 13.1 13.1 13.1 ZT4-7 60.1 60.1 60.1 ZT8-11 33.95 33.95 33.95 ZT12-15 54.95 54.95 54.95 ZT16-19 58.5 58.5 58.5 ZT20-23 64.8 64.8 64.8