condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.033179893 0.0 0.066359786 ZT8-11 0.0 0.0 0.0 ZT12-15 0.04169227350000001 0.0 0.08338454700000002 ZT16-19 0.11917174016666666 0.117266448 0.12107703233333333 ZT20-23 0.0 0.0 0.0