condition mean min max ZT0-3 28.851475 27.164900000000003 30.53805 ZT4-7 19.5824 19.5824 19.5824 ZT8-11 18.7632 18.7632 18.7632 ZT12-15 0 0 0 ZT16-19 23.47285 23.47285 23.47285 ZT20-23 25.89575 25.89575 25.89575