condition mean min max ZT0-3 11.5 11.5 11.5 ZT4-7 13.6 13.6 13.6 ZT8-11 14.850000000000001 14.850000000000001 14.850000000000001 ZT12-15 25.85 25.85 25.85 ZT16-19 24.0 24.0 24.0 ZT20-23 28.400000000000002 28.400000000000002 28.400000000000002