condition mean min max ZT0-3 2.8179195160000003 1.8339464330000002 3.8018925990000003 ZT4-7 4.164129895249999 3.6140031555 4.714256635 ZT8-11 4.73920228425 4.2359543115000005 5.242450257 ZT12-15 12.200301698999999 9.641833313 14.758770084999998 ZT16-19 14.092692042500001 13.16133312 15.024050965 ZT20-23 21.0973497675 19.66290525 22.531794285