condition mean min max ZT0-3 5.2094818975 4.135655418 6.283308377000001 ZT4-7 4.09765455975 3.1282186775 5.067090442 ZT8-11 5.6364512609999995 5.5548738295 5.7180286925 ZT12-15 4.92866489625 4.180263094 5.677066698499999 ZT16-19 6.69670924225 5.902794124 7.4906243605 ZT20-23 10.40217761975 10.147006416 10.657348823500001