condition mean min max ZT0-3 0.614686 0.250821 0.871293 ZT4-7 0.1969701 0.1969701 0.1969701 ZT8-11 2.418215 2.418215 2.418215 ZT12-15 5.718154999999999 4.71688 6.71943 ZT16-19 3.0929450000000003 3.0929450000000003 3.0929450000000003 ZT20-23 1.94063 1.94063 1.94063