condition mean min max ZT0-3 1.7189575000000001 1.6680800000000002 1.769835 ZT4-7 0.3520175 0.3520175 0.3520175 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.46892500000000004 0.46892500000000004 0.46892500000000004 ZT20-23 0.5870474999999999 0.5870474999999999 0.5870474999999999