condition mean min max ZT0-3 1.8842874270000003 0.546943693 3.2216311610000004 ZT4-7 0.6352812752499999 0.33364442699999997 0.9369181234999999 ZT8-11 2.49196753925 1.917960931 3.0659741475 ZT12-15 3.9132092177499995 3.1839479639999997 4.642470471499999 ZT16-19 1.6335491265 1.6080894175 1.6590088355 ZT20-23 1.689088361 1.5787374865000001 1.7994392355