condition mean min max ZT0-3 0.008859966666666667 0.0 0.014256350000000001 ZT4-7 0.014244650000000001 0.014244650000000001 0.014244650000000001 ZT8-11 0.011719615 0.011719615 0.011719615 ZT12-15 0.0211224 0.0203534 0.0218914 ZT16-19 0.054888400000000004 0.054888400000000004 0.054888400000000004 ZT20-23 0.01854355 0.01854355 0.01854355