condition mean min max ZT0-3 28.4 28.4 28.4 ZT4-7 53.6 53.6 53.6 ZT8-11 71.55 71.55 71.55 ZT12-15 65.95 65.95 65.95 ZT16-19 61.3 61.3 61.3 ZT20-23 48.45 48.45 48.45