condition mean min max ZT0-3 13.834320023750001 5.9036017775000005 21.76503827 ZT4-7 3.4273160160000002 1.7342800875 5.1203519445 ZT8-11 10.06522177375 7.165654397499999 12.96478915 ZT12-15 16.513954910000002 15.620938485 17.406971335 ZT16-19 19.7713334425 19.2725009 20.270165985 ZT20-23 14.674267877500002 13.298092315000002 16.050443440000002