condition mean min max ZT0-3 21.2 21.2 21.2 ZT4-7 30.7 30.7 30.7 ZT8-11 54.4 54.4 54.4 ZT12-15 39.2 39.2 39.2 ZT16-19 47.0 47.0 47.0 ZT20-23 39.9 39.9 39.9