condition mean min max ZT0-3 0.658528 0.5567259999999999 0.76033 ZT4-7 1.2168625 1.2168625 1.2168625 ZT8-11 6.371845 6.371845 6.371845 ZT12-15 0 0 0 ZT16-19 2.51892 2.51892 2.51892 ZT20-23 1.5404499999999999 1.5404499999999999 1.5404499999999999