condition mean min max ZT0-3 10.439417 10.439417 10.439417 ZT4-7 9.720949000000001 9.720949000000001 9.720949000000001 ZT8-11 9.465964 9.465964 9.465964 ZT12-15 10.153291 10.153291 10.153291 ZT16-19 10.799321 10.799321 10.799321 ZT20-23 9.6463785 9.6463785 9.6463785