condition mean min max ZT0-3 24.4 24.4 24.4 ZT4-7 23.8 23.8 23.8 ZT8-11 33.3 33.3 33.3 ZT12-15 48.7 48.7 48.7 ZT16-19 39.15 39.15 39.15 ZT20-23 33.9 33.9 33.9