condition mean min max ZT0-3 0.58647775 0.5155665 0.657389 ZT4-7 1.595065 1.595065 1.595065 ZT8-11 1.25448 1.25448 1.25448 ZT12-15 0 0 0 ZT16-19 0.6160215 0.6160215 0.6160215 ZT20-23 0.763111 0.763111 0.763111