condition mean min max ZT0-3 70.5089151 68.68219866 72.33563154 ZT4-7 46.4313677075 43.608172005 49.25456341 ZT8-11 17.3032933675 10.758007678 23.848579057000002 ZT12-15 6.10265848475 4.1516130485 8.053703921 ZT16-19 23.489407307500002 18.260737820000003 28.718076795 ZT20-23 44.9307427075 38.86051374 51.000971675