condition mean min max ZT0-3 17.90305 17.90305 17.90305 ZT4-7 15.93935 15.93935 15.93935 ZT8-11 12.7416 12.7416 12.7416 ZT12-15 14.174900000000001 14.174900000000001 14.174900000000001 ZT16-19 17.8709 17.8709 17.8709 ZT20-23 17.480249999999998 17.480249999999998 17.480249999999998