condition mean min max ZT0-3 0.764865 0.6350264999999999 0.9877535000000001 ZT4-7 0.36569450000000003 0.36569450000000003 0.36569450000000003 ZT8-11 0.523705 0.523705 0.523705 ZT12-15 0.43208749999999996 0.4184325 0.4457425 ZT16-19 0.37041650000000004 0.37041650000000004 0.37041650000000004 ZT20-23 0.5883244999999999 0.5883244999999999 0.5883244999999999