condition mean min max ZT0-3 0.9305859725000001 0.17491994 1.686252005 ZT4-7 4.1370400465 3.467475833 4.80660426 ZT8-11 6.367682364 5.143248703 7.592116024999999 ZT12-15 5.863013977 5.5272743355 6.1987536185 ZT16-19 2.4759625977499997 1.98664306 2.9652821355 ZT20-23 1.4413759640000001 1.2316683025 1.6510836255