condition mean min max ZT0-3 16.1120250325 15.081895925000001 17.14215414 ZT4-7 11.7099042675 11.06981284 12.349995695 ZT8-11 14.00873289 11.863189899999998 16.15427588 ZT12-15 7.9345355585 5.118949963 10.750121154 ZT16-19 4.77962412375 3.978134523 5.5811137245 ZT20-23 3.3127044469999998 2.924621214 3.70078768