condition mean min max ZT0-3 0.0844603015 0.05591703 0.113003573 ZT4-7 1.0453596305 0.6920791055000001 1.3986401554999999 ZT8-11 2.8647520012500003 1.9803143355 3.7491896670000004 ZT12-15 7.495924358 5.774762116 9.2170866 ZT16-19 6.34902432 5.958805551 6.739243089 ZT20-23 9.2582491125 7.9489235350000005 10.56757469