condition mean min max ZT0-3 0.2001164755 0.0 0.400232951 ZT4-7 2.3522564697500004 0.7858598584999998 3.9186530810000004 ZT8-11 4.924919371 4.5567785785 5.2930601635 ZT12-15 10.0490911295 8.140078919 11.958103340000001 ZT16-19 14.783982045 13.4243187 16.14364539 ZT20-23 24.272392425 18.86585881 29.67892604