condition mean min max ZT0-3 0.87982731275 0.164666013 1.5949886125000001 ZT4-7 3.929075998 2.2159283320000003 5.642223664 ZT8-11 9.2566309045 7.359419484 11.153842325 ZT12-15 5.79679138725 4.2404390105 7.353143764 ZT16-19 2.05158943025 1.7870168225 2.316162038 ZT20-23 0.85664296525 0.6530759645 1.060209966