condition mean min max ZT0-3 42.6 42.6 42.6 ZT4-7 21.3 21.3 21.3 ZT8-11 41.95 41.95 41.95 ZT12-15 34.5 34.5 34.5 ZT16-19 11.65 11.65 11.65 ZT20-23 15.850000000000001 15.850000000000001 15.850000000000001