condition mean min max ZT0-3 0.21469850000000001 0.115457 0.31394 ZT4-7 0.3794805 0.3794805 0.3794805 ZT8-11 3.7849950000000003 3.7849950000000003 3.7849950000000003 ZT12-15 0 0 0 ZT16-19 1.649355 1.649355 1.649355 ZT20-23 0.6860965 0.6860965 0.6860965