condition mean min max ZT0-3 18.491754154250003 9.5050275085 27.478480800000003 ZT4-7 4.84706046475 4.4483166895 5.24580424 ZT8-11 4.80901893475 4.2012740015 5.416763868 ZT12-15 4.9723419875 4.661291241000001 5.283392734 ZT16-19 7.6339515915 6.6271708435 8.6407323395 ZT20-23 16.780293535 12.30672489 21.25386218