condition mean min max ZT0-3 0.0698819485 0.0 0.139763897 ZT4-7 1.251815765 1.1414564725 1.3621750575 ZT8-11 0.52680830875 0.517325244 0.5362913735 ZT12-15 2.85699908125 2.001039326 3.7129588365000004 ZT16-19 4.3114389074999995 3.6630016585 4.9598761565 ZT20-23 4.310571787000001 3.5603744465 5.0607691275