condition mean min max ZT0-3 23.15 23.15 23.15 ZT4-7 39.2 39.2 39.2 ZT8-11 32.75 32.75 32.75 ZT12-15 38.15 38.15 38.15 ZT16-19 17.15 17.15 17.15 ZT20-23 18.95 18.95 18.95