condition mean min max ZT0-3 42.455 42.455 42.455 ZT4-7 39.11905 39.11905 39.11905 ZT8-11 23.180300000000003 23.180300000000003 23.180300000000003 ZT12-15 22.6171 22.6171 22.6171 ZT16-19 25.887700000000002 25.887700000000002 25.887700000000002 ZT20-23 37.8388 37.8388 37.8388