condition mean min max ZT0-3 2.36172 2.11781 2.60563 ZT4-7 0.923623 0.923623 0.923623 ZT8-11 1.46126 1.46126 1.46126 ZT12-15 0 0 0 ZT16-19 1.356335 1.356335 1.356335 ZT20-23 2.1217550000000003 2.1217550000000003 2.1217550000000003