condition mean min max ZT0-3 55.55 55.55 55.55 ZT4-7 62.8 62.8 62.8 ZT8-11 71.65 71.65 71.65 ZT12-15 49.15 49.15 49.15 ZT16-19 64.35 64.35 64.35 ZT20-23 62.1 62.1 62.1