condition mean min max ZT0-3 58.1 58.1 58.1 ZT4-7 59.9 59.9 59.9 ZT8-11 48.3 48.3 48.3 ZT12-15 55.45 55.45 55.45 ZT16-19 70.8 70.8 70.8 ZT20-23 75.2 75.2 75.2