condition mean min max ZT0-3 19.48075 19.48075 19.48075 ZT4-7 20.29035 20.29035 20.29035 ZT8-11 9.91902 9.91902 9.91902 ZT12-15 14.296800000000001 14.296800000000001 14.296800000000001 ZT16-19 21.90015 21.90015 21.90015 ZT20-23 17.58475 17.58475 17.58475