condition mean min max ZT0-3 0.426841 0.426841 0.426841 ZT4-7 1.050522 1.050522 1.050522 ZT8-11 1.4068245000000001 1.4068245000000001 1.4068245000000001 ZT12-15 0.607726 0.607726 0.607726 ZT16-19 0.4621465 0.4621465 0.4621465 ZT20-23 0.9501325 0.9501325 0.9501325