condition mean min max ZT0-3 27.5 27.5 27.5 ZT4-7 40.3 40.3 40.3 ZT8-11 12.850000000000001 12.850000000000001 12.850000000000001 ZT12-15 21.85 21.85 21.85 ZT16-19 40.3 40.3 40.3 ZT20-23 44.5 44.5 44.5