condition mean min max ZT0-3 0.277784375 0.237744167 0.317824583 ZT4-7 0.38685161874999996 0.19645543599999998 0.5772478015 ZT8-11 2.07499297025 0.8763321105 3.2736538299999998 ZT12-15 5.631390968750001 4.820241339 6.442540598500001 ZT16-19 3.74507560075 3.321534484 4.1686167175 ZT20-23 2.5642164385 2.3183944635 2.8100384135