condition mean min max ZT0-3 6.1 6.1 6.1 ZT4-7 5.0 5.0 5.0 ZT8-11 5.25 5.25 5.25 ZT12-15 12.1 12.1 12.1 ZT16-19 5.85 5.85 5.85 ZT20-23 13.850000000000001 13.850000000000001 13.850000000000001