condition mean min max ZT0-3 16.994318 16.994318 16.994318 ZT4-7 17.313568500000002 17.313568500000002 17.313568500000002 ZT8-11 17.041556 17.041556 17.041556 ZT12-15 14.184063 14.184063 14.184063 ZT16-19 14.340808500000001 14.340808500000001 14.340808500000001 ZT20-23 15.273118499999999 15.273118499999999 15.273118499999999