condition mean min max ZT0-3 10.124529 10.124529 10.124529 ZT4-7 62.607308499999995 62.607308499999995 62.607308499999995 ZT8-11 30.241785 30.241785 30.241785 ZT12-15 23.1443375 23.1443375 23.1443375 ZT16-19 9.747719499999999 9.747719499999999 9.747719499999999 ZT20-23 10.4966195 10.4966195 10.4966195