condition mean min max ZT0-3 2.2228674315 2.076779955 2.368954908 ZT4-7 9.50323673025 1.6751664745000001 17.331306986 ZT8-11 66.6066825875 47.233584565 85.97978061 ZT12-15 51.201949420000005 35.91623175 66.48766709 ZT16-19 23.414989420749997 17.4119519215 29.41802692 ZT20-23 5.36542914425 3.3176332545 7.413225034