condition mean min max ZT0-3 9.831225 9.831225 9.831225 ZT4-7 5.134475 5.134475 5.134475 ZT8-11 5.94684 5.94684 5.94684 ZT12-15 10.8194 10.8194 10.8194 ZT16-19 15.18165 15.18165 15.18165 ZT20-23 12.074850000000001 12.074850000000001 12.074850000000001