condition mean min max ZT0-3 2.0135149155 1.6707067310000001 2.3563231 ZT4-7 1.2627534925 1.068443463 1.4570635219999999 ZT8-11 1.10048252575 1.0732449555 1.127720096 ZT12-15 0.74155598575 0.6509734465 0.832138525 ZT16-19 0.7620775112499999 0.5844269314999999 0.9397280909999999 ZT20-23 1.6346491587499998 1.431290953 1.8380073644999997