condition mean min max ZT0-3 62.5 62.5 62.5 ZT4-7 11.1 11.1 11.1 ZT8-11 36.8 36.8 36.8 ZT12-15 34.4 34.4 34.4 ZT16-19 60.5 60.5 60.5 ZT20-23 74.8 74.8 74.8