condition mean min max ZT0-3 57.4 57.4 57.4 ZT4-7 18.2 18.2 18.2 ZT8-11 59.75 59.75 59.75 ZT12-15 45.65 45.65 45.65 ZT16-19 22.2 22.2 22.2 ZT20-23 39.95 39.95 39.95