condition mean min max ZT0-3 36.25 36.25 36.25 ZT4-7 34.1 34.1 34.1 ZT8-11 60.05 60.05 60.05 ZT12-15 51.95 51.95 51.95 ZT16-19 57.0 57.0 57.0 ZT20-23 65.9 65.9 65.9