condition mean min max ZT0-3 0.043886 0.043886 0.043886 ZT4-7 0.033455250000000006 0.033455250000000006 0.033455250000000006 ZT8-11 0.03179615 0.03179615 0.03179615 ZT12-15 0.09239985 0.09239985 0.09239985 ZT16-19 0.0728096 0.0728096 0.0728096 ZT20-23 0.08329785 0.08329785 0.08329785