condition mean min max ZT0-3 3.3209375000000003 2.9998 3.642075 ZT4-7 29.27265 29.27265 29.27265 ZT8-11 13.623750000000001 13.623750000000001 13.623750000000001 ZT12-15 0 0 0 ZT16-19 13.404725000000001 13.404725000000001 13.404725000000001 ZT20-23 13.09315 13.09315 13.09315