condition mean min max ZT0-3 37.35 37.35 37.35 ZT4-7 13.4 13.4 13.4 ZT8-11 21.0 21.0 21.0 ZT12-15 22.0 22.0 22.0 ZT16-19 11.45 11.45 11.45 ZT20-23 7.6 7.6 7.6