condition mean min max ZT0-3 12.378082711000001 10.683982992 14.07218243 ZT4-7 8.19892135225 8.1300351295 8.267807574999999 ZT8-11 18.54267582175 13.1272493985 23.958102245 ZT12-15 66.06686314000001 61.084966695000006 71.048759585 ZT16-19 47.512973932499996 39.387393675 55.638554189999994 ZT20-23 30.697549885 29.88182958 31.51327019