condition mean min max ZT0-3 122.811791 122.811791 122.811791 ZT4-7 60.8513565 60.8513565 60.8513565 ZT8-11 53.686898 53.686898 53.686898 ZT12-15 168.581548 168.581548 168.581548 ZT16-19 59.4731275 59.4731275 59.4731275 ZT20-23 123.88363749999999 123.88363749999999 123.88363749999999