condition mean min max ZT0-3 39.1 39.1 39.1 ZT4-7 44.8 44.8 44.8 ZT8-11 81.2 81.2 81.2 ZT12-15 51.4 51.4 51.4 ZT16-19 43.35 43.35 43.35 ZT20-23 40.85 40.85 40.85