condition mean min max ZT0-3 11.17725 6.894895 15.82365 ZT4-7 4.137955 4.137955 4.137955 ZT8-11 3.291015 3.291015 3.291015 ZT12-15 4.2891625 3.399015 5.17931 ZT16-19 4.250355 4.250355 4.250355 ZT20-23 9.675139999999999 9.675139999999999 9.675139999999999