condition mean min max ZT0-3 1.0505292907500001 0.35636674399999996 1.7446918375000002 ZT4-7 8.39412728875 7.0318225965 9.756431981 ZT8-11 7.471922409 7.449948835000001 7.493895983 ZT12-15 21.749267238 15.707632741000001 27.790901735 ZT16-19 23.4547736875 22.100703695 24.808843680000003 ZT20-23 30.2815938325 26.633440215 33.92974745