condition mean min max ZT0-3 62.7 62.7 62.7 ZT4-7 51.7 51.7 51.7 ZT8-11 79.85 79.85 79.85 ZT12-15 59.55 59.55 59.55 ZT16-19 76.35 76.35 76.35 ZT20-23 69.6 69.6 69.6