condition mean min max ZT0-3 83.1637 83.1637 83.1637 ZT4-7 83.26859999999999 83.26859999999999 83.26859999999999 ZT8-11 67.4942 67.4942 67.4942 ZT12-15 55.173199999999994 55.173199999999994 55.173199999999994 ZT16-19 25.4248 25.4248 25.4248 ZT20-23 42.9756 42.9756 42.9756