condition mean min max ZT0-3 1073.968764 1073.968764 1073.968764 ZT4-7 920.511977 920.511977 920.511977 ZT8-11 816.7925299999999 816.7925299999999 816.7925299999999 ZT12-15 945.6217225 945.6217225 945.6217225 ZT16-19 806.4198220000001 806.4198220000001 806.4198220000001 ZT20-23 597.258904 597.258904 597.258904