condition mean min max ZT0-3 1.29782625 0.744645 1.8510075 ZT4-7 0.556773 0.556773 0.556773 ZT8-11 0.7473559999999999 0.7473559999999999 0.7473559999999999 ZT12-15 0 0 0 ZT16-19 2.0162299999999997 2.0162299999999997 2.0162299999999997 ZT20-23 2.7609950000000003 2.7609950000000003 2.7609950000000003