condition mean min max ZT0-3 36.25 36.25 36.25 ZT4-7 15.7 15.7 15.7 ZT8-11 53.35 53.35 53.35 ZT12-15 34.85 34.85 34.85 ZT16-19 22.5 22.5 22.5 ZT20-23 39.5 39.5 39.5