condition mean min max ZT0-3 50.7 50.7 50.7 ZT4-7 42.6 42.6 42.6 ZT8-11 39.05 39.05 39.05 ZT12-15 49.1 49.1 49.1 ZT16-19 42.15 42.15 42.15 ZT20-23 61.0 61.0 61.0