condition mean min max ZT0-3 59.7 59.7 59.7 ZT4-7 31.2 31.2 31.2 ZT8-11 26.6 26.6 26.6 ZT12-15 59.5 59.5 59.5 ZT16-19 39.5 39.5 39.5 ZT20-23 55.35 55.35 55.35