condition mean min max ZT0-3 39.35 39.35 39.35 ZT4-7 51.2 51.2 51.2 ZT8-11 37.6 37.6 37.6 ZT12-15 75.25 75.25 75.25 ZT16-19 72.25 72.25 72.25 ZT20-23 65.4 65.4 65.4