condition mean min max ZT0-3 3.5550410364999996 2.622437246 4.487644827 ZT4-7 2.176323229 1.9829738860000001 2.369672572 ZT8-11 1.825482643 1.7622971834999999 1.8886681025 ZT12-15 1.94734178125 1.6641310964999998 2.2305524660000002 ZT16-19 2.726315734 2.6700627575 2.7825687105 ZT20-23 3.7940883557499996 3.680410444 3.9077662674999996