condition mean min max ZT0-3 0.2861535 0.0 0.572307 ZT4-7 0.9074120000000001 0.9074120000000001 0.9074120000000001 ZT8-11 0.16693 0.16693 0.16693 ZT12-15 0 0 0 ZT16-19 0.49037699999999995 0.49037699999999995 0.49037699999999995 ZT20-23 0.9856130000000001 0.9856130000000001 0.9856130000000001