condition mean min max ZT0-3 42.622233333333334 25.1903 57.1662 ZT4-7 29.251649999999998 29.251649999999998 29.251649999999998 ZT8-11 9.6319 9.6319 9.6319 ZT12-15 27.345595 15.16124 39.52995 ZT16-19 22.66875 22.66875 22.66875 ZT20-23 28.560650000000003 28.560650000000003 28.560650000000003