condition mean min max ZT0-3 14.93855 14.073049999999999 15.80405 ZT4-7 19.896549999999998 19.896549999999998 19.896549999999998 ZT8-11 13.1267 13.1267 13.1267 ZT12-15 0 0 0 ZT16-19 12.8444 12.8444 12.8444 ZT20-23 15.051300000000001 15.051300000000001 15.051300000000001