condition mean min max ZT0-3 14.165665569999998 10.83529211 17.49603903 ZT4-7 21.05250195 20.23918453 21.865819369999997 ZT8-11 13.5894275645 11.849909524000001 15.328945605 ZT12-15 10.15563958325 8.4162108765 11.895068290000001 ZT16-19 17.544902014999998 13.912043555 21.177760475 ZT20-23 40.7562461675 32.05727154 49.455220795