condition mean min max ZT0-3 52.2 52.2 52.2 ZT4-7 52.1 52.1 52.1 ZT8-11 63.7 63.7 63.7 ZT12-15 29.4 29.4 29.4 ZT16-19 46.85 46.85 46.85 ZT20-23 59.8 59.8 59.8