condition mean min max ZT0-3 5.800000000000001 5.800000000000001 5.800000000000001 ZT4-7 37.6 37.6 37.6 ZT8-11 37.0 37.0 37.0 ZT12-15 12.55 12.55 12.55 ZT16-19 13.5 13.5 13.5 ZT20-23 8.5 8.5 8.5