condition mean min max ZT0-3 44.55 44.55 44.55 ZT4-7 11.8 11.8 11.8 ZT8-11 16.5 16.5 16.5 ZT12-15 34.6 34.6 34.6 ZT16-19 40.35 40.35 40.35 ZT20-23 40.0 40.0 40.0