condition mean min max ZT0-3 0.401628202 0.150403602 0.652852802 ZT4-7 2.29004515975 2.277364704 2.3027256155 ZT8-11 1.08769946875 0.9780702860000001 1.1973286515 ZT12-15 4.16182427975 2.766155791 5.5574927685 ZT16-19 15.47574275425 10.8335875835 20.117897925 ZT20-23 34.182812042500004 28.14395965 40.221664435