condition mean min max ZT0-3 16.646875 15.92165 17.3721 ZT4-7 15.4674 15.4674 15.4674 ZT8-11 11.181405000000002 11.181405000000002 11.181405000000002 ZT12-15 0 0 0 ZT16-19 16.634149999999998 16.634149999999998 16.634149999999998 ZT20-23 26.87205 26.87205 26.87205