condition mean min max ZT0-3 44.25 44.25 44.25 ZT4-7 29.2 29.2 29.2 ZT8-11 48.3 48.3 48.3 ZT12-15 64.35 64.35 64.35 ZT16-19 33.0 33.0 33.0 ZT20-23 65.2 65.2 65.2